12,000 gal concrete IG, Sta-Rite MaxEGlas 3/4 HP pump (230v 8A) Sta Rite System 3 Filter, Hayward Ultra crawler.
10% Bleach bottles on bottom of pool. AquaChek 7 Strips, Clorox SmartStrips, Bakersfield City water.
Welcome to TFP,
In answering this specifically on its own, Sea Water without question. Whether it's in relation to corrosion by being more conductive in a metallic system, or deposited on things it can corrode it's Sea Water by far. Is there something more specific you're inquiring about?