Chlorine lock can occur when there is too much cyanuric acid (also referred to as conditioner or stabilizer) in the water. This occurs when too much stabilizer is added to the water or when the swimming pool isn't being partially drained and refilled periodically. Chlorine lock can also occur if the pH is unbalanced. Jul 26, 2013 - For example, if you have a 21,000 gallon pool, I would add 9 pounds of pool shock. Before adding pool shock, make sure you cyanuric acid (chlorine stabilizer) levels are correct (30 to 80 ppm) and remember to shock at night because the sun eats up chlorine. Feb 7, 2017 - Remember, chlorine lock isn't a real thing, but many pool and spa . drain the hot tub and clean the sides and plumbing of your spa thoroughly . Sep 19, 2015 - That is, the CYA (cyanuric acid or 'stabilizer') is too high. All of that shock you dumped in the pool and all the cranking up of the chlorinator has . Intelliclor IC40, Intelliflo VS pump, Clean and Clear 420 Filter, auto-fill-disabled, . May 27, 2008 - One of the least exciting things to hear when you go to a pool store is, . We need to oxidize that 5.7 ppm in order to break the chlorine lock. . On the up side, it's not an 'all or nothing' proposition: you can take I'm going to suggest to you the same thing I suggested to Frank in a previous comment: pick a . The pool store is tellimg me I have 'chlorine lock' due to organic . lined pool.had ahell ofa time getting the water clean upon start up 3 weeks . Apr 15, 2015 - If a pool smells strongly of chlorine - what you smell is combined chlorine, or chloramines. . Chlorine & Cyanuric acid are components of water balance. . Pool water can be clean and clear but whacked on pH, alkalinity Sign up to receive exclusive offers and updates by entering your e-mail address. For swimming pool water to be hygienically safe for swimmers it must be properly . the stabilizer will 'tie up' the chlorine and make the chlorine unavailable for .