We had a new pool installed and was finished the first of April. We decided to go with a SWG installation because of the supposed 'ease' of upkeep on these pools. I've owned pools in the past and they were exclusively regular chlorine pools. This one has been a nightmare so far. Since April the pool contractor has replaced three Pentair Whisperflow 1.5 hp 2-speed pumps because of seal/bearing/impeller screw corrosion. The first indication we had of corrosion was rusing of the bolts on our stainless steel ladder. The water was initially set up by the contractor recommended retail outlet nearby and i've taken it to them for adjustments every two weeks since. At first the chlorine levels were quite high during the first three weeks, but after adjustments parameters are to quote the retail outlet, 'perfect'. For some reason, they had me add stabilizer 4 times at first, but now the levels are @ 56. Chlorine varying between 3-4, ph, alkalinity and dissolved solids within norms. Salinity is @ 3400ppm as recommended by Pool Pilot (Digital with SC-36 cell running as two speed). Pool capacity is 25,000 gal. We had the pool bonded beyond life so to speak. everything was triple bonded, pump, pool pilot head unit, auto fill, ladder, aluminum coping, outlets, aluminum fencing, 'park' type light post, 600 watt low voltage transformer for lighting around pool... everything. They replaced one pump this past Sunday, and by wednesday the seal had started leaking. They took the pump apart and the screw had already deteriorated to the point of needing to be replaced and the seal/bearing/spring was covered in rust! What the heck is going on here?!..