Thanks for the suggestions. After 1/2 refill and fixing the problem of high phosphates by adding chemical for that and then cleaned out filter 48 hours later, the pool is back to normal.
You can be sure I will be testing more frequently to maintain better.
The hardness is a bit low but I was told that's not really a problem and to leave it since it will naturally rise from chlorine as season goes forward.
Chlorine block continues
Chlorine block continues
I would check the ammonia level. See what that reading is and if that doesn't work than I wouldn't know what else to do. I guess you could try getting some new inground pool liners. My friend had a similar scenario and he switched out his liner and his problem went away. He got his liners from http://milliespoolandspa.com/ but there could be a build up of chlorine or other chemicals that are behind the liner.
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