New to BBB and a definite believer--thanks! I let the pool service manage the chemistry the last two years and things are way out of whack. Just tested Mar 1 and found CYA 99, CH 380, pH 8.2+, TA 170, CSI 1.1. I've drained the pool 70% to reduce CYA and TA and want some advice on this hard deposit on the tiles at waterline. They do not fizz at all with muriatic acid even full strength 31.45%. So there's not much calcium in the deposits, probably silica and CYA and whatever else was in the pool to get hot (108 F here) and concentrate as water evaporates, and deposit on my tile.
CLR and a stiff wire brush cleans the top and bottom of the tile from their white haze but only a grinder with wire wheel will take off the thick deposits in the center of the tiles. Amazingly, it appears not to damage the tiles and a good sealer will make them shine like new. But I'll have days with the grinder to do my 20x40 pool. High pressure water cleaner breaks off about 5% in little chunks.
Then I'll keep pH at 7.2 and CSI at -0.2 and add borate so it doesn't happen again.
I've heard of glass bead blasting and know some pricey contractors have a device to catch the beads and keep them out of the pool and impeller.
Any experiences? Suggestions?