Hi Rosie,

Two major possibilities that I see are your calcium level and the fact that you aren't keeping your chlorine levels high enough for your CYA. With a CYA of 60, you should be keeping your chlorine above 5 ppm at all times. I would turn the SWCG off, shock the pool to 20 ppm, and hold it there until you can go from sundown one night til just before sunup the next day without losing more than 1 ppm of chlorine, then you can let your chlorine drift back down to the 5-10 range. Keep your filter running and clean your filter as indicated by your pressure.

It's also possible that with your hardness that high, combined with high alk, that you're getting calcium precipitated out of the water and creating the clouds. Is your fill water that high in calcium, or have you been using calcium-based shock products?