Anthony Sylvan 17k gal free form IG Gunite. 3' - 6'. Waterway SVL56 Pump. Pentair FNSP 48 (sq ') DE Filter (2013). Polaris 280 sweep w/Polaris PB4 booster. 2 skimmer intakes and 2 deep-end intakes. 4 returns. Pool Installed 2010. Filled from city water (Austin, TX - CH 50ppm. pH 9.0). Taylor k-2006 test kit. Currently running the pump 6 hrs / day.