How much liquid shock for 30000 gallon pool

For the cal-hypo product we recommend, that is about three pounds per 10,000 gallons of water. 4. Turn on your pool filter. The filtration system will help to distribute the shock more evenly, giving you much better results. 5. Add the shock to your pool. Follow the manufacturer’s instructions for adding shock to your pool.

Use the following charts to determine the proper dosage for your Kem-Tek products. That can be a lot to keep track of on your own, so we're here to help. For help with a specific question, you can call our free helpline at 1-800-SOS-POOL (767-7665) For above-ground pools (average depth 3-4 feet) 12-foot. 15-foot.Choosing the right pump for your 30,000-gallon pool can make all the difference when it comes to keeping your pool clean and properly circulating water. ... turn off the power to the pump at the breaker box to avoid any electrical shock or damage to ... You will need a pool pump with a flow rate of at least 60 gallons per minute to efficiently ...Feb 11, 2024 · Test Your Pool Water: Before adding liquid chlorine to your pool, use a reliable pool water test kit to measure the current chlorine level. The ideal chlorine range for most pools is between 1.0 to 3.0 parts per million (ppm). Determine Required Dosage: Calculate the amount of liquid chlorine needed to raise the chlorine level to the desired ... 12.5% Liquid Chlorine Pool Shock – Normal Dosage: 1 gallon of shock per 10,000 gallons of water. Shock Dosage: 2 gallons of shock per 10,000 gallons of water. Source: Champion Liquid Pool Shock instructions. 75-78% Calcium Hypochlorite Granular Pool Shock – Shock Dosage: 1 lb (bag) of shock per 10,000 gallons of water.Pour the mixture in the spa water. Pour the hot tub shock mix around the hot tub. Always do this carefully as any spilled outside may do some damage. 6. Wait for the shock to do its job. It can take anywhere between 20 minutes and 24 hours for the hot tub shock treatment to work depending on the type and amount used.

30,000: 76 oz: 62 oz: 32 oz: 40,000: 101 oz: 83 oz: 43 oz: You can use this bleach or liquid chlorine here: Recommended. Champion Pool Shock Liquid Chlorine. Commercial-strength liquid chlorine (aka bleach or sodium hypochlorite) ... How Much Bleach is Needed for 10,000 Gallons of Pool Water? Remember that one gallon is equal to 128 ounces, so ...Boost it up to 30 ppm by adding 3 lbs of Stabilizer per 10,000 gallons of pool water, to protect free chlorine from the sun. ... Shock is liquid or granular chlorine. You should add one gallon (or one pound) of shock per 10,000 gallons of pool water every week to two weeks. During hot weather or frequent use, you may need to shock …Next, multiply your pool’s length and width and then multiply that number by the average depth. Finally, multiply that figure by 7.5 to calculate the volume of the pool in gallons. For example, if your pool is 32 feet long, 16 feet wide, and has an average depth of 6 feet: 32 × 16 × 6 × 7.5 = 23,040 gallons.Pool Advisor. Phone: (07) 3130 0298. Address: 1228 Sandgate Road, Nundah, QLD 4012. Email: [email protected]. ABN: 40463637406. This pool chlorine dose calculator will calculate exactly how much liquid or solid chlorine you need to add to your pool!Here is the chart that you have to use for shock treatment based on the color of the pool. For light green pools, use 1 lb. of shock treatment per 10,000 gallons of water. So, for 25,000 gallons of water in pool, use 2.5 lb. of shock treatment. For medium green pools, use 2 lb. of shock treatment per 10,000 gallons of water.The general recommendation is to use 1 pound of cal hypo shock for every 10,000 gallons of pool water, and 10 ounces of sodium hypo with around 12.5% chlorine to sanitize your pool. Make sure the pool water is at its normal level. How much chlorine do I need for 10000 Litres?

Here are a few tips before we dive into the chart: If you are using chlorine products as your primary sanitizer, we recommended to maintain a residual chlorine level of 2.0-4.0ppm to effectively kill bacteria and prevent algae. You may want to adjust the chlorine quantity depending upon the weather, seasonality, and your pool usage.Matt teaches you how to shock your swimming pool the right way by pre-dissolving each pound of pool shock in a bucket of water before adding it to the water.... As an example, for a 50,000 L pool with a combined chlorine level of 2 ppm, you would need to add 1.0 kg of available chlorine to achieve superchlorination. Considering that bleach provides 125 g/L of available chlorine, you would need to dose 8 L to shock properly. These figures can be confirmed in the calculator above. Calculating the Right Amount of Salt for Your 30,000 Gallon Pool. Step 1: Determine the salt level you want to maintain. Most saltwater pools have a salt level between 2500-4000 parts per million (ppm). Decide on a salt level and use a pool salt calculator to determine how much salt is needed.Finally got a larger pool then we've ever had, but it's still small. 475 gallons. Has a 300 gallon pump/ filter that came with it. I have no clue how to take care of anything like this without completely draining it, scrubbing it and re filling it every time and that's a huge job with a bigger pool like this. I just want it to stay as clean as possible without having to completely drain the ...So, for 25,000 gallons of water, use 5 lb. For dark green colored pools, it is better to use 3 lb. per 10,000 gallons of water. So, for 25,000 gallons of water, you have to use 7 lb. Conclusion. So, if you had a question in your mind regarding how much liquid chlorine to shock a pool with algae, you probably have now gotten the answer.

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Pool Girl - For a 25,000-gallon pool, I would start the chlorinator at a high setting then back off if your chlorine level gets too high. If you are getting algae at the bottom of your pool, you may have a water circulation problem. I would get a suction pool cleaner to help circulation on the lower levels.Pour the required amount of Clorox bleach into the pool and stir the water. Allow your pool to soak for 3 hours. If the water is still green after that time, repeat the procedure. When the water is clear, you need to check the chlorine content. It should not exceed 1.0-5.0.Desired Calcium Hardness: 300. 0. 1000. Recommended 200-400ppm. Calculate. PLEASE FILL IN ALL FIELDS! Swimming pool calcium hardness must be managed to maintain balanced pool water. Recommended range for pools is between 200-400 ppm. Having the calcium hardness out of range can lead to problems with water quality and equipment damage.An introduction to determining how much shock is needed for a 3000 gallon pool: Under normal circumstances, it is recommended that you use 1 lb of shock per 10,000 gallons of water. Therefore, the amount of chlorine needed to effectively clean and sanitize your 3000 gallon pool would be approximately 0.3 lbs (or 5 ounces), assuming normal conditions.

This pool chemical helps to keep your water clear and sparkling by preventing and treating algae. A 128 oz. bottle of Algicide + Clarifier costs $10.98. Users report pouring in about a cup of the solution per week into a 30,000 gallon pool to remove pool cloudiness. Water stabilizersLiquid pool shock is also available. Ensure the pool pump is running. Pour the mixture into the water, around the edges of the pool. Let the pump run for about six hours or more. Test the water to ensure proper chlorine levels. Don't use the pool right away. Wait for the free chlorine levels to drop to 1 to 3 ppm.Mar 29, 2023 · For a 10,000 gallon pool, you may need to add up to 2 quarts of liquid shock. Step 3: Dilute the liquid shock in a bucket of water. Never add liquid shock directly to the pool. This can cause a chemical reaction and damage the pool surface. Instead, dilute the shock in a bucket of water, stirring to mix thoroughly. Calculating the Amount of Liquid Shock for a 15000 Gallon Pool Pool Volume Calculation. Calculating the volume of your pool is the first step in determining the appropriate amount of liquid shock to add. Accurate volume measurement ensures that you provide your pool with the necessary treatment without over or under-dosing. To …Matt teaches you how to shock your swimming pool the right way by pre-dissolving each pound of pool shock in a bucket of water before adding it to the water....As a very general rule, pool experts advise that for every 10,000 gallons or water, you’ll need to add one pound of shock. However, if your water is very dirty or you’re experiencing extreme algae problems, you may need to double or quadruple this amount to get your pool clean again.Jun 15, 2023 · For general pool maintenance, add one pound of shock for every 10,000 gallons of water in your pool. But if you’re experiencing algae issues, you’ll need to add more shock: Light Green or Teal Green Pool Water (early-stage algae): Double shock your pool with two pounds of shock per 10,000 gallons. For this example, let's say you have a 20,000 gallon pool and the pool pump has a GPM rating of 40. Grab your calculator to figure this out: 40 (GPM) X 60 (minutes per hour) = 2400 gallons per hour. 20,000 (gallons) / 2400 (gallons per hour) = 8.3 hours. In this case, the ideal pool filter pump run time is 8.3 hours per day for one circulation ...12,000 x 8.35 x (0.0032 - 0.0012) 12,000 x 8.35 x 0.0020 = 200.4 pounds. That means you need to add about 200 pounds of salt to the pool water to bring your salt levels up to 3,200 PPM. Generally, pool salt comes in 40-pound bags, so you'd need 5 bags of salt to get the 200 pounds you need.It's important to choose the right pump size based on your specific pool needs, to ensure proper circulation and filtration. 1.5 HP Pump: This is a common pump size for 30,000 gallon pools. It can typically handle up to 100 gallons per minute (GPM) and is suitable for most pool applications.An example would be for a 62,000-gallon pool, if the pH is 7.8 with an alkalinity level of 90, you would like the pH level to be 7.4 (ideally), so you would add approximately 88 oz., or 2.6 quarts of muriatic acid. A pool chemical dosage calculator can be used. Try this one..

You can execute a shock treatment with a few different types of pool shock, just be mindful of how much you're using. How many pounds of shock do I need for a 30000 gallon pool? Typically for granular shock, you'll need one pound for every 10,000 to 13,500 gallons of pool water. With over 8 million residential swimming pools across the US ...

First, make sure to regularly test the water chemistry and adjust the pH and chlorine levels as needed. It's also important to regularly clean the pool and skimmer baskets to remove debris and prevent clogs. Finally, consider investing in a pool cover to keep out leaves and other debris when the pool is not in use.A general rule of thumb is to add one gallon of 12. 5% liquid sodium hypochlorite per 10, 000 gallons of water to raise the chlorine levels by 10 parts per million (ppm). However, if the pool hasn't been shocked in a long time or after heavy rains or lots of swimming activity, you might need to double up on that amount.Matt teaches you how to shock your swimming pool the right way by pre-dissolving each pound of pool shock in a bucket of water before adding it to the water....To use pool shock for roof cleaning, mix one pound of pool shock per gallon of water. Be sure to wear gloves and eye protection when handling the mixture. Apply the mixture to the affected areas with a garden hose or pressure washer. Let it sit for 15-20 minutes before rinsing it off with fresh water. Pool shock is an effective and … To find out how much shock your pool needs, carefully follow the product measurement instructions. For example, the instructions may recommend that you use one pound of shock per 10,000 gallons of water. Note: Some situations, such as an extreme algae bloom, may require a double or even triple dose of pool shock. You should consult an expert ... The best-rated product in Pool Shock is the 1 lb. 68% calcium hypochlorite Chlorinating Shock (24-Pack). What's the price range for Pool Shock? The average price for Pool Shock ranges from $10 to $250. While shocking is the simple addition of a few parts per million (usually 2‒5 ppm) of unstabilized chlorine to “clean up” pool water, breakpoint chlorination or superchlorination, on the other hand, is performed when there’s a measurable amount of combined chlorine causing odors and irritation. For the proper dosage amount, take the ...

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Below, you'll find a Pool Cyanuric Acid Calculator to help you determine the proper dosage for your pool. Cyanuric acid (CYA), sometimes referred to as stabilizer or conditioner, protects your Free Chlorine (FC) from being consumed by sunlight. CYA sort of acts like an umbrella or sunscreen for your Free Chlorine.Dec 19, 2019 · If pool clarity problems began with an algae bloom, be sure to kill algae before clarifier treatment. This requires 10-30 ppm of chlorine, with a suitably low pH of around 7.2. Operate the filter 24 hours per day during treatment, or as long as possible each day and night to improve circulation and filtration. With an uptick of swimmers in the pool, the chlorine has to work extra hard to keep it all clean, resulting in a more rapid depletion and consumption. 3. There Was Heavy Rain. A pool's chemical makeup can be easily upset, and even a rainstorm can throw things out of whack. Rain is usually slightly acidic.The size of the pool heater required for a 16×32 inground pool depends on the pool volume. For a standard 16×32 pool with an average depth of 5 feet (about 21,000 gallons), you would need a heater with approximately 105,000 watts (21,000 gallons x 5 watts/gallon) or 105 kW to efficiently maintain the desired temperature.Clean the pool before shocking, to remove leaves or debris. Lower the pH level to 7.2, to increase pool shock potency. Sprinkle shock into pool, or broadcast across the surface. Vinyl pools should pre-dissolve in a 5-gal bucket of water. Run the filter and brush the pool afterwards to disperse.Sort By: 6 results. Leslie's - Chlor Brite Sodium Dichlor Granular Chlorine Pool Shock 1 lb. Bags, 12-Pack. $109.99 $119.88. Shop Now. Leslie's - Chlor Brite Sodium Dichlor Granular Chlorine - 25 lbs. $224.99. Shop Now. Leslie's - Chlor Brite Sodium Dichlor Granular Chlorine - 40 lbs.With all this information in mind, it's ideal to add 1 pound of powder shock per 100 gallons for healthy pools and 2 pounds per 100 gallons for very dirty onesHow Much Powder Shock Do I Need for a 1000 Gallon Pool? Are you looking for the ideal amount of shock powder to adjust the pH balance of your 1,000-gallon pool?A good rule of thumb is one pound of granular shock per 10,000 gallons of water. You can also shock using liquid chlorine, using the rule of 1 gallon per 10,000 gallons of pool water. Keep in mind, liquid chlorine is only 10-12% chlorine whereas granular chlorine is 55% if using di-chlor and up to 73% if using cal-hypo.The amount of chlorine required per gallon of water depends on the type of chlorine used to treat the pool. A daily dosage of 11 ounces of liquid chlorine is recommended for every 10,000 gallons of water. A 10,000 gallon pool requires 6 to 8 ounces of granular chlorinator each day.To double shock, you will need to add 2pounds for every 10,000 gallons of water. For instance, ifyou pool is 20,000 gallons, you will add 4pounds of shock. Green or Dark Green Pool Water: Thismeans there’s a medium amount of algae in your water and you’ll need to triple shock your pool.First of all, we’d like to extend a warm welcome to all of our new community members and HASH Token holders. We are grateful for the support you’ve shown this far and are excited t... ….

The granular shock is more shelf-stable than liquid chlorine (liquid chlorine loses some of the chlorine if it sits around too long), might contain additives (calcium, algaecide, or stabilizer), and tends to be more expensive. Most of the one-pound bags of shock raise the chlorine level in a 10,000-gallon pool by 5-10 ppm; 64 ounces (1/2 gallon ...Liquid pool shock is also available. Ensure the pool pump is running. Pour the mixture into the water, around the edges of the pool. Let the pump run for about six hours or more. Test the water to ensure proper chlorine levels. Don't use the pool right away. Wait for the free chlorine levels to drop to 1 to 3 ppm.For a 1000 gallon pool, the amount of shock needed will depend on the manufacturer's recommendations and the current water chemistry. Refer to the manufacturer's guidelines to determine the appropriate dosage per gallon, and multiply this dosage by 1000 to calculate the amount of shock required.Liquidity is the total amount of assets that you can immediately convert to cash, that you or a business has on hand. Your personal liquidity is your cash worth – how much money yo...Note this number. Next, multiply the chemical change by the divided pool volume and the CC/FC difference . Convert the answer into pounds by dividing it by 16. This answer tells you how much pool shock you need to add. A good rule to remember is to use one bag of shock per 10,000 gallons.Before you can lower pH by adding muriatic acid to pool, you must adjust TA to be within 80 – 120 ppm. Step 1: Test the Water. Use test strips or a kit to measure pH and alkalinity levels. Ideal ranges are pH 7.4-7.6 and alkalinity 80-120 ppm. Calculate chemical quantities based on test results.Generally speaking, you should use about 1-3 ounces (4-12 teaspoons) of household bleach per gallon of water in your pool. “It’s crucial to add enough chlorine to your pool but not too much, ” said John Smith, owner of a local pool cleaning company. “Adding too much can cause skin irritation or even damage the lining.”.For a simple rule of thumb, Leisure Pool & Spa Supply, Inc. says that generally, you'll need 2 gallons of shock per 10,000 gallons of water. How much chlorine to shock and clear out algae? Steve Heap/Shutterstock. Also, you might wonder how much chlorine would shock a pool with an algae problem.How much does it cost to heat a 30 000 gallon pool? The average cost is between $1,500 and $3,000 depending on the water temperature you set. This is for heating from May 1 through September 30. ... How much water does a heat pump heat? The heat pump should be able to heat the water by approx. 0.20 - 0.25 degrees per hour. It takes 1.16 Wh to ... How much liquid shock for 30000 gallon pool, A typical amount of chlorine in pool shock is about 1/2 teaspoon per gallon of water. You should dilute pool shock by adding about 2.5 to 3 teaspoons per gallon of water. Stores sell chlorine tablets that contain other chemicals. These chemicals make chlorine last longer, but they also reduce its effectiveness., In a clean, freshly filled 500 gallon wading pool, add a quarter cup of unscented household liquid chlorine bleach to the water. Then, at the end of each day, test the water and add an additional 1/8 to 1/4 cup, depending on the reading., If youre trying to shock your pool, then you will need to add 1/2 gallon per 10,000 gallons of pool water to raise it to 5 ppm. On the other hand, if you are just raising your chlorine levels, 1/4 gallon per 10,000 gallons will suffice., So, for 25,000 gallons of water, use 5 lb. For dark green colored pools, it is better to use 3 lb. per 10,000 gallons of water. So, for 25,000 gallons of water, you have to use 7 lb. Conclusion. So, if you had a question in your mind regarding how much liquid chlorine to shock a pool with algae, you probably have now gotten the answer., Monroe shocks use a gas-pressurized cylinder to cushion hard jolts and keep the vehicle stable on the highway. These shocks can wear out or leak, lowering efficiency or failing com..., Did you know a 3-inch chlorine tablet will sanitize up to 5,000 gallons of water? So if you have a 20,000 gallon pool, you'll need to add 4 chlorine pucks ev..., Before we delve into the intricacies of shock treatment, it’s essential to grasp the significance of understanding the water volume of your 500-gallon hot tub. While the name suggests a 500-gallon capacity, it’s crucial to account for the displacement caused by the occupants and various hot tub components., For this case, you are required to use a shock of 2 pounds for every 10,000 gallons of pool water. In case the pool is dark green in color, or there are heavy black or yellow algae …, For 3-inch chlorine tablets, add 1 tablet for every 5,000 gallons of pool water, which is about 4 tablets for a 20,000-gallon pool. If your pool holds 10,000 gallons of water or more, 3-inch tablets work great. But they can quickly overwhelm smaller pools, so opt for 1-inch tablets, granules, or liquid chlorine instead. For liquid chlorine, add ..., With a 12% concentrate, the liquid pool shock is around 2 times stronger than Clorox bleach. The CDC suggests 5 tablespoons of normal bleach per one gallon of water to normally disinfect a surface. Therefore, when you are using a liquid pool shock, try to dilute it at a rate of around 2.5 to 3 tablespoons per gallon of water., The PoolRX Extreme Unit is good for up to 30,000 gallon pools (more minerals may be required if pool is larger than 30,000 gallons). The PoolRX Extreme Unit needs to be replaced at the beginning of each swimming season or every 2 years for a pool that is used all year round. It is a natural mineral clarifying process using, nature's own purifiers., Prepare the shock in a bucket of pool water and mix well, then pour the mixture into the water around the edges of the pool. Ensure you run your pool filter for a minimum of 6 hours after you shock your pool so it has time to mix with the water and so your filter can clean the water. It is recommended to shock your pool once a week. When ..., To shock your pool, use 2 pounds of shock for every 10,000 gallons of water, which should raise your chlorine to 10.0 ppm. Depending on your pool, you can use Leslie’s Power Powder Plus or Leslie’s Chlor Brite. After shocking the pool, run the circulation system for at least 2 hours before adding an algaecide., Most chlorine packaging will tell you how much to use to raise your water by 1 ppm per 10,000 gallons, but here's pretty much what you can expect: Type of granular chlorine. To raise 1 ppm per 10,000 gallons. Dichlor (55-62%) 2.4 oz by weight. Trichlor (90%) 1.5 oz by weight. Cal-hypo (48%) 2.8 oz by weight., For example: chlorinating 10 gallons of water with a dose of 5 mg/L (ppm), would require the following: 5 x 10 = 3.8 mL of bleach. 13.2. 5 x 10 = 0.115 mL of HTH, or. 434.6. 5 x 10 = 8.3 mL of concentrated hypochlorite solution made from 1 level tsp HTH in. 6.04 half a canteen cup (1 ½ cups) of water. b., Here is the chart that you have to use for shock treatment based on the color of the pool. For light green pools, use 1 lb. of shock treatment per 10,000 gallons of water. So, for 25,000 gallons of water in pool, use 2.5 lb. of shock treatment. For medium green pools, use 2 lb. of shock treatment per 10,000 gallons of water., 29,093-Gallons Nominal Capacity. DIAMETER. 26′ 4″ Diameter. WALL HEIGHT. 7′ 2″ Tank Wall Height. Get 30,000-Gallon water storage tanks for your best price per gallon. Our standard 30,000-Gallon water tanks are approved for residential and commercial systems. Pioneer Water Tanks are backed with our 20-Year warranty on the tank body and ..., Use a spray nozzle on your garden hose to spray down the cartridge or manifold, making sure to get between the pleats. Fill a large, acid-proof bucket with water. Then add the correct ratio of muriatic acid (20:1 water to acid). Make sure the cartridge or grids are completely submerged., Generally speaking, you should aim for one to two gallons of 12.5% liquid chlorine per 10,000 gallons of water. You can try one gallon first and see how it goes …, You can execute a shock treatment with a few different types of pool shock, just be mindful of how much you're using. How many pounds of shock do I need for a 30000 gallon pool? Typically for granular shock, you'll need one pound for every 10,000 to 13,500 gallons of pool water. With over 8 million residential swimming pools across the US ..., Liquid shock usually is sold by the gallon size container, which can be heavy and take up lots of space if you're going to need a lot. Powdered shock is sold by the pound size bag, but will usually have to be pre-mixed in a bucket of water to prevent staining of the vinyl swimming pool liner. Some advantages of the liquid type shock is that ..., Calcium-hypochlorite is typically recommended for residential pools and typically requires 1lb per 10,000 gallons of water. Other types of shock, such as granular hypochlorite, will require different amounts. Lastly, the pH level should be balanced and between 7.2-7.8., 1/2 a bag OS shock. How much shock n swim do you put for a 3800 gallons pool? 1/2 a bag will cover up to 5,000 gal & is still safe for a 3800 gal pool; use 1/2 a bag about every 4 to 6 days., This is just half the distance from one side of the pool to the other. With that information, use the following formula to calculate the pool volume: Volume = (3.14 x r2 x depth) x 7.48. For a round pool with a radius of 5 feet and a depth of 6 feet, your pool's water volume is 3,533 gallons. Once you know your pool volume and how much salt ..., The amount of bleach used to shock a pool depends on the size of the pool. Shocking a pool requires increasing the chlorine to 5 parts per million. This means you need 1/2 gallon o..., The ideal cyanuric acid level is typically between 30 and 50 parts per million (ppm). With the chlorine level, pool volume, and cyanuric acid level in hand, you can now use a chlorine dosage chart or an online calculator specifically designed for pool maintenance to determine the precise amount of chlorine to add., That is good liquid chlorine to use. In your 30,000 gallon pool gallon poured in will give you a bit over 3ppm of FC., Pool Advisor. Phone: (07) 3130 0298. Address: 1228 Sandgate Road, Nundah, QLD 4012. Email: [email protected]. ABN: 40463637406. This pool chlorine dose calculator will calculate exactly how much liquid or solid chlorine you need to add to your pool!, Calculating the Amount of Liquid Shock for a 15000 Gallon Pool Pool Volume Calculation. Calculating the volume of your pool is the first step in determining the appropriate amount of liquid shock to add. Accurate volume measurement ensures that you provide your pool with the necessary treatment without over or under-dosing. To calculate the ..., Liquidity is the total amount of assets that you can immediately convert to cash, that you or a business has on hand. Your personal liquidity is your cash worth – how much money yo..., This will give you about 10 ppm for 10,000 gallons of water. To figure out how much you need, you’ll need to know the size of your pool (in gallons) and the current CYA level. For example, if you have a 20,000 gallon pool and the current CYA level is 20 ppm, you’d need to add about 3 doses of the product to bring it up to 50 ppm., The CDC recommends about five tablespoons of regular Bleach per gallon of water to disinfect a surface. For a liquid pool shock, it is preferred to dilute it at a rate of 2.5 to 3 tablespoons per gallon of water. For a pool with 5000 gallons of water, you should use around 15 ounces or 4 cups of Clorox bleach to raise the free chlorine level in ..., That either means that the bleach was closer to 12% (unlikely, unless you use chlorinating liquid which indeed is around 12.5%) or the spa is closer to 150 gallons. It is also possible that the chlorine was not fully mixed in the water, though if you had the pump circulation on it should get mixed rather quickly.