Well I'm now using city water for fill water since the TA of the well water is 300+. Using PoolDocs "HOWTO: Step-by-Step Guide to lowering your alkalinity" I've been able to bring my TA down to 240 from 300 in about 6 days. Is that about right time wise? I've got good areation going since I came up with a 45 degree adapter for my return on the pump and it's breaking the water surface nicely. Don't know how I'd do it without this forum.
Steve