My alkalinity is very low (20 ppm) and I havent been adding sodium bicarb. I have a SWG and my chlorine is sometimes higher than needed on the lowest setting (likely because my pool is quite small) so that is constantly raising my pH.CO2 injection does not reduce TA. So be sure to check if your fill water is high in TA and if that is the source of your pH rise.
I dont have another test kit to compare to, but I suspect my colorq is accurate because it does show consistent readings on my hot tub and it reflects the changes I make when I add acid. I brought my pH down from 7.9 to 7.5 last night and by morning it was back up to 7.7Given the choice between believing some very unusual water behavior or that a ColorQ is spitting out bad data, I'm leaning heavily towards the latter.
Do you have any liquid based tests to confirm these readings?
Highly unlikely if the TA is really 20. We're missing some key information. Do you have an acid feeder?I brought my pH down from 7.9 to 7.5 last night and by morning it was back up to 7.7
I did take a sample to the pool store to double check on the TA and CH as I my kit is about 3 years old now so I wanted to get a reference. Since my TA was only 20 ppm and I've not added any sodium bicarb (I got tired of fighting with it causing my pH to rise even more) i cant imagine there would be any rise in my TA levels.The TA reagent of the ColorQ has had several bad batches shipped out. LaMotte technical support will confirm this if you call them and give them the lot id of the reagents you have. The ColorQ also doesn’t measure CH very accurately as it is more of a total hardness (TH) reagent and not a true CH test. You can purchase an inexpensive TA test or simple pool water testing kit that includes TA to cross check your ColorQ.
Consistency, precision, and accuracy are not the same things. Any test can be consistently wrong with very precise results if the underlying test chemicals or equipment are compromised in some way. ColorQ’s are known to go bad with age and give bad results. This is why TFP doesn’t typically recommend them or trust their results much.
I've got a 10000 litre fiberglass pool with a SWG and hayward cartridge filter.Highly unlikely if the TA is really 20. We're missing some key information. Do you have an acid feeder?
What is the CSI?
What are the chemistry readings
What is the chemistry history?
What is the pool size and type?