At this point, action must be taken to avoid reaching overstabilization-partial draining with the addition of fresh water and a temporary switch to unstabilized chlorine for daily sanitation. For every pound of dichlor added (roughly two 3" tablets) to 10,000 gallons of water, the CYA increases 6‒7 ppm. For every pound of trichlor added (roughly two 3" tablets) to 10,000 gallons of water, the CYA increases 7 ppm. Daily application can easily lead to a concentration of 80 parts per million (ppm) CYA. Both dichlor and trichlor are over 50% CYA by weight. Overstabilization tends to occur most frequently in water treated with dichlor or trichlor, particularly if dichlor granules are used for superchlorination ("shocking"). Too much, and the chlorine can become overstabilized ("locked"), which decreases its sanitizing and oxidizing effectiveness. Too little stabilizer and the free chlorine will not be adequately protected. In either situation, it’s important to monitor the CYA level. ![]() Outdoor pools and outdoor, uncovered spas that use these non-stabilized chlorines require the separate addition of CYA. (calcium hypochlorite, lithium hypochlorite, sodium hypochlorite, and chlorine gas) do not. Stabilized forms of chlorine, such as dichlor and trichlor, contain CYA in their formulas. Cyanuric acid (CYA), also called stabilizer or conditioner, is used in pools and spas exposed to the sun to reduce the rate of decomposition of available chlorine by ultraviolet rays in sunlight.
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