Baquacil and Chlorine are not compatible and if added will turn the water green and throw off all of the other readings. The product that can be used to fix this is called Baquacil Chlorine Neutralizer. You also have to change the sand in your pump, or it will gum up
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Chlorine is not compatible with Baquacil. Baquacil is hydrogen peroxide and will cause a reaction. Most times the water turns green and throws off all of the other readings. If CL is accidentally added the Baquacil product to remove it is called Baquacil Chlorine Neutralizer.
Baquacil can be difficult to remove from the water but its not impossible. First have your baquacil sanitizer levels tested. If they are above 30g/ml or 30ppm you can either 1. Allow the baquacil sanitizer level to naturally drop OR partially drain to dilute the sanitizer. Next you will need to lower your pH to 6.8-7.0. You will then need to add Non-Chlorine shock (Potassium Monopersulfate) at a rate of 4lbs / 10,000 gals of water. Run filter continuously for 48 hours. Test the baquacil sanitizer level. You are aiming for a level of 10ppm or below. If you have not reached that yet you must repeat the previous process with another 4lbs of Non-Chlorine shock and running your filter another 48 hours. Once you have reached your 10ppm or lower goal, you can start with the conversion process. Adjust your pH back to 7.2 - 7.6. Start shocking with liquid chlorine (Sodium Hypochlorite) (preferably in the evening). The amount to be added will vary depending on concentration. Check the directions on the box for manufacturers recommendations. Because of a likely high chlorine demand, shocking may be required for 7-10 days. Also watch for a precipitate to form. Brush the pool regularly and run filter continuously to remove. Don't allow the precipitate to settle as it may stain the pool. Once a free available chlorine residual has been formed balance the water and begin a routine chlorination schedule.