OK, got my pool resurfaced in January from failing plaster to tile. All Tile. Like an idiot, I started out using test strips and managed my pool as if my CH was high. I also followed the directions on the stabilizer after filling the pool and my CYA was 100 after that.
I believed the strips that my CH was high because I started to see white growths at spots on grout all around the pool, under water. I tried to manage this by bringing my TA and PH down a bit and adding a STAIN/METAL out. Seemed to help.
But with the high CYA, my FC is high and I suspect throwing the strips off. Taking advice on this forum, I just purchased a Taylor FAS-DPD K-2006. Kit arrived yesterday and here are my results:
16,000 gallon pool
FC - 14.5
CC - 0
PH - 7.2
TA - 90 (unadjusted for CYA)
CH - 90
CYA - 110
Temp - 78-80F
My test strips were giving me dramatically different PH, TA, and CH readings.
I used the Pool Calc for iPhone I found from this site for the following:
I immediately drained enough water to lower CYA to 80, hopefully. I'm in Hawaii with plenty of direct sunlight, so that should be reasonable, right?
After refilling, I added about 8 lbs baking soda to raise TA, I hope to about 110. I then added 10 lbs Calcium Hardener to work toward my goal of 200. I estimate I'll need another 5 lbs.
Tomorrow I will retest and after getting CYA, TA, and CH inline, I will work getting PH at 7.4
I'm using a floater with TriChlor Stabilized 3" tabs for daily sanitizer and shocking weekly, as well as adding algaecide weekly.
I would appreciate any advice on the above, and any thoughts on the white growths on my grout, underwater. Is that Calcium leaching out of the grout? Thanks so much for all the help this forum has given.