AJustice

Thanks Waterbear I have been using the strips and I will do as you have recommended with all the other things. I appreciate you providing this information and in such a way that a novice like myself can understand it. Thank you very much.

I have an inground pool - gunite with a white surface that was nice when we purchased the house 2 years ago. Last year we noticed toward the end of the season a slight discoloration to the pool surface (floor mostly but also on steps and walls). All our water levels test fine except slightly high on the cya reading at 100ppm. pH 7.8, fc 4, hardness 400, alkalinity a little high at between 180 and 240. The pool seems to stay this way regardless of what we do. We have water restrictions and can not drain and refill. The discoloration of pool does not rub off with vac or chlorine tab rubbed over it. Tried the rubber type brush from pool store - no difference either. Pool store tells us water is ok. Can not figure out why the discoloration which is like a very light yellow-brown-mustard color. Does not seem to get worse or better within doing things or not doing things to the pool. Is it possible that this is a sign that we need to have it resurfaced? Some areas seem to be thinner than others, but the discoloration is in addition to that. First time pool owner and taking care of it myself. Have a cartridge filter pump system (not sand or salt, no back flush system) approx 10,000 gallons. Any suggestions? Thanks!