my readings are hardness:250, TC:3, FC:between 2-3, PH:7.6, alk:120, Stabilizer:100. chlorine tablets that I put in a tube and it releases from there. My regime: once a week I test water usually all readings are ok. then I vacuum. after that I backwash then rinse. then I add chemicals. chlorine granules 3lbs, pool perfect-2 capfuls, algaecide-6oz, soda ash 2 to 3 lbs. pool is a fiberglass. my readings on test and drop kits are usually ok. I am a new pool owner bought a house with a pool. pool when we first moved in in november was beautiful crystal clear water. just leaves on the bottom. buy chemicals from the guy who maintained it for years. this is the recipe he always used and water was beautiful. the water remained beautiful until I started adding chlorine granules then got cloudy. I was not adding the tablets to the tube because i did'nt understand you had to use those with the chlorine. pool pro said put those in and should clear. did not clear and now I have this powdery substance. pool pro is super busy and hard to get on the phone. I have backwashed and vacuum to waste and can see the powdery substance draining out. pool still cloudy but will keep vacumming every day. not sure what this is or how to avoid getting it. any help would be appreciated