TA too low @ 50ppm?


LifeTime Supporter
May 9, 2015
Fullerton, CA
Ran to tests today
FC was 10ppm
TA was at 50
PH was 7.8
CH was 650
Salt 2800
cYA 65
Csi -0.03
Temp 59

Just never had TA go below 60-70, odd. FC is high as I adjusted the salt cell %.


Mod Squad
LifeTime Supporter
Jul 10, 2012
Tallahassee, FL
Check your CSI using Pool Math. If it is close to 0.0 then you are good to go. If it is not then you can play with the numbers to see what needs to be adjusted to make it close to 0.0. Know that the water temp plays a big part in the CSI

Here is some info on CSI:

"CSI Calcite Saturation Index - requires pH, TA, CH, CYA, Temp, uses Borate, Salt
Less than -0.6 is suggestive of problems for plaster, tile, stone, and pebble pools.
Greater than 0.6 is suggestive of problems for all pools."

Pool School - Calcium Scaling

I hope this helps.