Low ph, no chlorine, low CYA

I really need some help. For some background information, I have had this 25,000 gallon in-ground chlorine pool with a sand filter for 8 years and I have never had any troubles. I keep the solar cover on, the pool is heated to 89 degrees, and we have not used it much this year so the cover has been on most of the time. I run my filter all the time and I use the floating chlorinators with the chlorine pucks.

This year I cannot maintain my pH or chlorine. I have been at 0 free chlorine and...

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