Hi, my water is "dull" and I keep getting a yellow sand like substance on the walls and floor. My latest readings are,
FC 6.5
CC 0.19
TA 57
PH 7.5
CYA 44
It has passed the OCLT test dropping by just 0.2 ppm
When I vac the pool this "sand" is back again the next day, my water has been crystal...