Hi, we have a 33,000 gallon SW pool with a vinyl liner and auto cover, it was built two years ago. We opened the pool two weeks ago, the water had been crystal clear until today. Last night the free chlorine was between 1-2 and pH was 7.5. Today I opened the auto cover and the water was super cloudy-when I checked the chlorine it was zero. I then did my weekly chemical check use the Carefree pool kit with the following results:
No color change with the chlorine test
I was told by the pool builder that I didn't need to add stabilizer when they opened the pool. We had difficulty keeping chlorine in the pool last summer too, at that time when they tested for CYA it was almost zero so we added it.
I now have the system set to super chlorinate for 24 hrs.
My questions are:
1. Should I be "losing" CYA? (I haven't add much water at all)
2. Should I treat with liquid bleach since I'm super chlorinating?
3. What is causing the chlorine loss? (I super chlorinated after a heavy bather load on Monday so I just don't get it!)