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I read that you should subtract 1/2 of your CYA measured value from your measured alkalinity. The resulting number is your effective alkalinity value. Is this true? If so does the TFP alkalinity range take this into account?

what "trade" means (unchangeable field after the user entered % in Poolmath's FC sect Hi, Am unclear on what's the right way to enter chemical info for FC. I buy 10% chlorine from Home Depot (as shown on the jug label). Should I enter "10" in the fill form of Pool Math? I am confused what...

Thanks. Didn't see the CSI factor and was paying attention to the items I listed.

Sorry but I don't know what CSI is and could only find a couple of reference to something called Calcite Saturation Index. It looks like having a stable pH of 7.7 and a TA of 110 is okay. Am I understanding correctly? Here's my stats from latest sample: FCL 3.7 TCL 3.7 TA 110-120 PH 7.7 CH...

The Recommended Levels for TA says TA 70-90+ for plaster with Bleach. The card included with my TF-100 kit say 100-120 for manually chlorinated pools. My TA measures 110-120 ppm. Don't know why there is a difference in the recommended targets. Do I have any reason to do anything?