Accurate CYA reading

[Mark Officer]

New to pools. Depending on the store, when I take my water in to get it tested I have gotten readings of 60 to 100 for CYA. I am using bleach, borax, baking soda, muratic acid and some calcium hardener as chemicals. Are their tests just wrong or why would it go up if I'm not using any tri/di chlor? No tablets either. Alkalinity = 94, pH =7.8-8.0, CH = 265, FC 2.1, CC 2.1.

Also when I use the Taylor K2006 and my other test strips it shows 60-70 for CYA.

Pool 17k gallons, I just drained about 12-15 inches and refilled.

 

[Msch99]

Example of why we don’t trust pool store tests?

 

[DorsalSpine]

Your FC is too low for that level of CYA. Do you have a FAS-DPD test for chlorine?

 

[BowserB]

Yes, their tests--at least some of them--are probably wrong. Just shooting from the hip, but I would get a gallon of 10 or 12.5% chlorine and pour it in now with your pump running for a while. Tomorrow morning, test the chlorine and CYA with your Taylor test kit (not the strips--they're not accurate either even though they have the Taylor name on the bottle.