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Just starting with pool in AZ and has a heavy scale buildup at the water line. What is best way to remove this and clean to the tile and then what is recommended to maintain. Never had to deal with hard water buildup like this before, water was never this hard with my other pool and didn't...

No algae problem and chemistry is within acceptable range for all tests. When I backwash not seeing anything is discharge either. Filter pressure doesn't rise either, does go down a couple of PSI when backwash, but when issue returns is still only 2-3 # above backwashed level.

Have an old in ground concrete pool, late 1960 install. The last couple of years been having flow issues where suction water is poor. Last year replaced the filter and thought that would solve it and seemed to for a period. This year cleaned filter pre season and started with new batch of DE...