Hi,

I have a 25k gal inground gunite pool. The chlorine level drops to almost 0 after about 2 days after being shocked. PH and AL are within range. Shock is new, tabs are kept in floater. Not abnormally hot and pool is used very infrequently. Filter recently cleaned and turns over water about 3x/day. Yellow algae is forming on walls and stairs.

I also have a lot of small white particles floating on the surface of the pool. Initially I thought it was shock that didnt break down but it must be in the air because it keeps coming and I tried different shock. I'm stumped. Any ideas?