Got Ta Down But Ph Still Too High?

[Reeser]

So Ive been testing my spa water...finally and found the PH always to high, in the 8's range and the Total Alkalinity was close to 180 or 190. I got some Sodium Bisulfate and have been adding it and have the TA down to 100 but the PH is still up around 8 or so. Any ideas why the PH did not go down and now what I need to do to get the PH down?

Thanks!

Reese

[waterbear]

main cause of pH rise in a spa is outgassing of CO2. The higher the TA the faster CO2 outgasses. Keep adding acid ahd lower the TA more. 100 is still a bit high for spas that have a lot of aeration.

[GSmith]

Reese has it been raining where you are? I have PH problems if it rains alot. I do not find the covers keep all the water out.

1/4 drain the tub and refill will drop the levels then add Alk to stabilize.

I buy PH down from Home Hardware but I live 4 hours north of Toronto and have no access to no name chems.

So Ive been testing my spa water...finally and found the PH always to high, in the 8's range and the Total Alkalinity was close to 180 or 190. I got some Sodium Bisulfate and have been adding it and have the TA down to 100 but the PH is still up around 8 or so. Any ideas why the PH did not go down and now what I need to do to get the PH down?

Thanks!

Reese

[waterbear]

Reese has it been raining where you are? I have PH problems if it rains alot. I do not find the covers keep all the water out.

1/4 drain the tub and refill will drop the levels then add Alk to stabilize.

I buy PH down from Home Hardware but I live 4 hours north of Toronto and have no access to no name chems.

So Ive been testing my spa water...finally and found the PH always to high, in the 8's range and the Total Alkalinity was close to 180 or 190. I got some Sodium Bisulfate and have been adding it and have the TA down to 100 but the PH is still up around 8 or so. Any ideas why the PH did not go down and now what I need to do to get the PH down?

Thanks!

Reese

With TA that high the additional aeration caused by rain can cause pH to rise but the main reason the OP has pH problems is because the TA is just way too high. The higher the TA the faster CO2 will outgas and outgassing of CO2 is the MAIN cause of pH rise in spas since they have so much aeration when in use.

High TA is usually a fill water issue (unless one goes overboard with the baking soda/alkalinity increaser--here it is most definitely a case of more not always being better!)

Instructions on how to properly lower TA can be found here and here. Read both!