thanks Janet. Wow, lots of info there. An update on my IG vinyl pool with DE filter: Let filter run 24/7, ph dropped to 7.1 from 7.5 overnight (no rain) and Cl dropped to 3.0 after shocking 24hrs ago. Other factors remained the same CYA 30, Alk 40, Cal 30. Slowly getting less green. Keep running 24/7? Adjust pH with Borax or wait? Any opinion on this metal remover product? http://www.culator.com/

thanks,
tony