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Good news -- FC was 6.1 this morning (9.8 yesterday am), so chlorine demand of 37%. So glad I don't have to drain again!

Yes, sand filter (Pentair TR-100C) for the 700 gal tub. (Don't get me started about that contractor...) Followup: I ran the Ahh-some with the pump set to Recirculate and got a disappointing amount deposited at the waterline (nothing like the video, but it was green and yucky). I then...

Thanks, JVTrain -- you guys are awesome. That sand filter thread is just what I need.

Any thoughts as to the Ahh-Some with a sand filter? 1) I currently plan to run it through the filter as normal while foaming, then shut the pump off and clean the goop. 2) Then set the plumbing to go straight from tub to waste (bypassing the filter). 3) Open the filter and clean as much goop...

$30 digital pen meter on water sampled at about 18" depth. While it's not lab quality by any stretch of the imagination, it's been quite repeatable in the tests I've done with it. The kicker is that when I put X oz of a salt like Sodium Bromide, the increase is fairly in line with expectations...

Thanks SO much for the thoughts!! The fill water TDS was 55 ppm. After running the pump for 24 hr, the reading was to 111. I attribute the increase of 56 ppm to whatever was in the filter/lines. That means more than 5 oz of "something" (probably something bad), right? Taylor K-2106 and test...

After a broken heat exchanger, my (in-ground, 700 gal, fiberglass) tub sat covered with partial water for 2 months. Big mess to clean up now. So after draining and cleaning any staining with diluted (1 Tb acid:2 c water) muratic acid (and rinsing), the tub was looking good. Filled with water...