I bumped into you forum looking for reasons for and appropriate dosing levels for borax in pools. I use trichlor so have noticed a creep to more acidic conditions over the summer. Anyway, I don't have any questions; just wanted to fulfill the post requirement for new members. A few details, which I guess I can add to my profile: I have a concrete pool that was built in the mid-seventies. It's 16 x 60 ft with a 9 ft deep end, so about 55K gallons. It's equipped with 600 pound Sta-Rite sand filter, a 20 puck inline flow-through chlorine dispenser, and a 5 ton heat pump. Luckily, I have a rather productive well I use to fill the thing each spring, though water, really, is a minor cost. Lee