TA doubled in a few weeks.....reasons?

glo76

Bronze Supporter
Jun 3, 2015
87
Missouri City, TX
#1
I'd been holding my TA down around 60-70 all winter and enjoying very stable pH, around 7.8. In the past couple of weeks my TA shot up first to 90 and now is at 120. The only things added to my pool in that time were liquid chlorine and MA, though I had just stopped using tricolor in a floater to raise CYA.

As the weather has warmed up we've had increasing evaporation and I've been topping the pool up about once a week (manual fill). My fill water TA is high at 180 but I've only topped off 2-3 inches, 2 or 3 times. By my maths, 2" in my pool is about 750 gallons or about 5% of my water....so I can reconcile maybe a 5-10 point rise each top up, but not as much as I'm seeing. I'm going to lower pH and aerate to bring it back down but want to check - is there anything else that can cause TA rise that quickly?

Rest of my numbers from measurement this evening....FC11.5, pH 8.2, CYA60, CH300.
 

Richard320

TFP Expert
LifeTime Supporter
Jan 6, 2010
20,328
San Dimas, CA (LA County)
#2
Out of curiosity, did you get fresh refills for the test kit recently? There is a known problem with fresh bottles of R-009 getting static electricity which causes small drops which makes falsely high readings.
 
OP
OP
G

glo76

Bronze Supporter
Jun 3, 2015
87
Missouri City, TX
#3
Wow....I should have thought of that. The drops do seem smaller and I did recently change to a new bottle that I'd bought a while back. I just searched on the static buildup and will try wiping the tip. Thanks!