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Sounds like great advice, Bruce. I did get a pebble tech estimate from the original builder. Would that be a better solution? Today, after a lot of backwashing and refilling, the CH was 1000. PH 7.5, FC 8.5, CC .5, TA 50, CY 50. And, I just took delivery of a Caldera Aventine 2-person spa...

Actually, that is how i did the retest in my post above: OK, re-test pool using 10 ml water, required 62 drops = 1550 ppm CH. Tap water was 22 drops = 550 ppm CH.

Well, for my lazy ***, 140 drops was too many to wipe. ;) Edit: no, sir, I did not wipe. So, How much error might there be? I guess this explains all the little white granules that are showing up in my strainer sox after I put in clarifier and algecide. good thing I held off on the...

No, that is a garage tap that is un-softened, same as the spigot that fills the pool. Great catch! I'll have to check the kitchen sink water. Then I can test the R/O tap and see what it contains. Probably all 0s. It can generate about a 1/2 gallon a minute. How long would it take to fill...

I just called, got an estimate of $500 for their treatment. Not a bad price, but I am planning to re-finish the plaster, so I'll have to drain it then. I can't drain it in the summer here, with daytime temps in the 100s, right? So, when I drain it in Oct. for the refinish (thinking Epoxy...

OK, re-test pool using 10 ml water, required 62 drops = 1550 ppm CH. Tap water was 22 drops = 550 ppm CH. This is in Mesa, Az. My water softener is set to 18 grains hardness. Does that check out? csi is -0.05 assuming 2000 ppm salt. My guess is that evaporation has caused the CH to...

It took 140 drops and constant swirling to turn the cylinder blue. This is my first test with the TF-100. Readings: PH 7.2 FC 5 CC 0 TA 60 CH 1400 CYA 45 I have a 25 year old plaster pool, 20,000 gallons, SWG and sand filter w 3/4 Jandy Stealth. I just re-started a negative edge waterfall...