CH suddenly low?

Joe_Fire

0
LifeTime Supporter
Sep 20, 2012
16
South Florida
I've never struggled with low CH. Lately for the last couple of weeks I'm reading 150. This pool has always been on the high side 250-300+ usually. Plaster pool about 13 years old. Everything else is close to normal for me anyway. this mornings results TFTtest with new chemistry.

FC 5 ppm
PH 8.2 (before adding acid)
TA. 130
CH 150
CYA 70
Temp 86
Salt 2600 Taylor test

What can cause low CH? It's been a fairly dry and cool winter/spring here(South Fl). With the heater keeping the water at 85 I've had more evaporation than I'm used to. Was convinced I had a leak until I passed a bucket test. So have had to add more water than usual. Rain usually keeps this pretty full.
I'm not even sure what to add to bring it up.
As I was writing this I decided to test my tap water. 50. That could be the problem;).
 
Last edited:
I went from having high CH water in my pool to low CH when the water company improved my house water quality and lowered the CH in it. House water tastes and feels different and showers heads no longer get clogged.