Amount of TwinOxide to Use Per Gallon of Pool Water

Pools and spas are great ways to stay cool and spend time together as a family, but safety always needs to be first and foremost. Both in terms of staying safe in the pool, as well as safe ways to keep the pool clean. Keeping a pool sparkling clear isn’t the easiest project. Whether you have a round ring-top pool or an in-ground pool, maintaining it to be free of bacteria and algae can be a challenge, especially in the warm summer temperatures. Pools have traditionally used chlorine as the preferred chemical treatment of water, but chlorine has been found to have many disadvantages. For example, there are known carcinogenic by-products from the use of chlorine, it is only effective in a small pH window, requiring the water to be stabilized first before treatment with chlorine, and it typically burns people’s eyes and bleach their clothing if not kept in very tight tolerances. TwinOxide (Chlorine Dioxide) has been found to much more effective at maintaining crystal clear pool/spa water without the harmful by-products of Chlorine. 

Today there is a better alternative to chlorine, that is chlorine dioxide. While chlorine is in the name, there is not actually any chlorine in the product. Chlorine dioxide, or CLO2, is a highly effective oxidizing agent and can disinfect and sanitize water at much lower concentrations than chlorine, and has none of the harmful by-products that chlorine has.

TwinOxide-USA Inc., is the sole importer in the United States and Canada of TwinOxide. TwinOxide produces a 99.9% pure solution of CLO2 through a simple two-part powder (or two tablets for smaller volumes of water) at a 3,000 PPM concentration for the powders (and 1,000 PPM concentration for the tablets). TwinOxide kills all waterborne microorganisms, including spores, bacteria, viruses, protozoa, fungi, yeast and algae) at a much broader pH range than Chlorine. 

Pool Size

Before you add the TwinOxide, you need to know how many gallons of water are in the pool/spa. For a Constant Depth, Square or Rectangle Pool, you calculate the volume using Length (in feet) x Width (in feet) x Depth (in feet) x 7.5 = Volume (in gallons). For example, a pool that is 25 feet long by 10 feet wide and 4 feet deep is calculated by: 25 feet x 10 feet x 4 feet x 7.5 = 7,500 gallons. To ensure accurate TwinOxide dosages, make sure to use the actual depth rather than the maximum depth, pool manufacturers often cite a depth, but that is the maximum depth, whereas the actual depth may be almost a foot shallower. For variable pool depths, take the average depth or divide the pool into separate volume calculations and add together for total volume.

For a Constant Depth, Round Pool, you calculate the volume using 3.14 x Radius Squared (in feet) x Depth (in feet) x 7.5 = Volume (in gallons). For example, a pool that is 20 feet in diameter (a radius of 10 feet) and 3 feet deep is calculated by: 3.14 x (10 x 10 feet) x 3 feet x 7.5 = 7,065 gallons. To ensure accurate TwinOxide dosages, make sure to use the actual depth rather than the maximum depth, pool manufacturers often cite a depth, but that is the maximum depth, whereas the actual depth may be almost a foot shallower. For variable pool depths, take the average depth or divide the pool into separate volume calculations and add together for total volume.  

Adding TwinOxide

Before adding TwinOxide to the pool, test the current TwinOxide (if it has ever been added to the pool) with a low range (0.1 – 1.6 Parts Per Million) chlorine dioxide test strip kit. The range is listed as Parts Per Million (PPM) and uses metric calculations so gallons should be converted to Liters to ensure that the calculations are correct. To convert from Gallons to Liters, multiply the number of gallons by 3.785 (3.785 Liters per gallon).

TwinOxide can be used in conjunction with chlorine and generally makes any chlorine levels in the pool much stronger so care should be given if existing chlorine levels are near the high end of typically swimming pool or spa levels (3-5 ppm). Adding TwinOxide at these levels will cause the chlorine to raise to higher levels resulting in possible clothing bleaching, equipment corrosion and burning of eyes.

Generally, you should maintain the pool’s TwinOxide level between 0.2 and 0.6 PPM. Initially, you may want to start at the 0.6 PPM level as the TwinOxide removes all of the algae, spores, bacteria and biofilms and then lower the level to 0.2 residual and maintain it at this level.

If your water is testing at 0.1 ppm and you need to raise it to 0.2 ppm, you would take the difference (0.2 – 0.1 or 0.1 ppm) and use the 0.1 ppm values. For example, if our pool is a round, constant depth pool 20 feet x 4 feet, our calculation would be:

  • 3.14 x 100 feet x 3 feet (remember to use actual depth, not maximum depth) x 7.5 = 7,065 gallons.
  • To convert 7,065 gallons to Liters multiply by 3.785 = 27,377 Liters.
  • To raise 27,377 liters 0.1 ppm, using 3,000 ppm TwinOxide (made from the powders, alternatively, use 1,000 ppm if using the TwinOxide tablets), we can either use the table below and look at the closest volume (7,500 gallons[28,388 Liters]), or use the calculation below,

((Water Volume to Be Disinfected in Liters) x (Dosage Rate in PPM))/3,000 PPM =  Liters of 3,000 PPM TwinOxide to be used, OR, ((27,377 x 0.1 PPM))/3,000 PPM = 0.9126 Liters.    

It’s as easy as that! You will be swimming in crystal clear water that is free from potentially carcinogenic by-products, with no bleaching of clothing, no burning of eyes in no time at all!

Remember, you can always reach out to us if you have any questions or need any additional information, we are always here to help. Additionally, for more information on using TwinOxide in Pools and Spas, look at the Pools/Spas Application page

Take care and enjoy your pool or spa!

Table of Liquid Measures:

2 Tbsp. = 1 fl. oz. 1 qt. = 2 pt. 29.57 mL = 1 fl. oz.

1 cup = 8 fl. oz. 4 qt. = 1 gal     128 fl. oz. = 1 gal

2 cups = 1 pt.   3.79 liters = 1 gal   32 fl. oz.  = 4 cups

 

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