Hi everyone, I'm new to this group and was hoping an expert can help me. I have a 20,000 vinyl liner pool, no heater, and use cl to sanitize. It looked great after opening except stains on bottom. I used ascorbic acid and metal free as directed and now have a cloudy milky pool. THIS IS THE SECOND time I DID this!! Can you believe it. Last year same thing. My water was as directed this year with Cl .5, PH 7.5, 140. Added Ascorbic acid sunday night, stain came off right away, added metal free as directed. By monday night the pool was milky cloudy with a white material building up on the pool D.E. filter (I backwashed). My local pool store KNOW NOTHING. What is going on and how do i fix it? Last year the local people had me throw tons on stuff into it and it cleared in about 2 weeks. There has got to be a better way. And lastly what did i do wrong......help and thanks