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  1. J

    Need help with undiagnosed (in ground gunite pool) problem

    Hi All, im brand new here with a mysterious problem i'm unable to diagnose. A little about me and my pool It's a 16000 gal in ground gunite pool with Heyward DE filter and a polaris model 3900 I've had the pool for about 25-30 years and the pool was totally redone 4 years ago. Now the...