High Ph low TA

[SylKal]

TC-5
Ph-9.1
TA-50
CYA-50

There are a couple things I can think of contributing to a consistently high Ph, we have a Fastlane Swim Pro that the wife uses for her Triathlon training 3-4 times a week and the pool is about 2yrs old (plaster). My TA has been slowly dropping over the past few weeks and I know if I add sodium bicarbonate to raise it 8 will also raise the Ph.

 

[mknauss]

How are you testing a pH of 9.1.
Really hard to have that pH with a TA of 50.

 

[SylKal]

I have a pH tester

 

[SylKal]

I’ve been chasing the pH from day one when we opened the pool.

 

[mknauss]

I would calibrate that pH tester.
Do you have a K1000 pH test block?

 

[SylKal]

No sir

 

[SylKal]

I just calibrated it today

 

[SylKal]

My pH has always been high. I just attributed it to the pool being new and the Fastlane. But now the pool is two years old and I’m still battling the pH.

 

[SylKal]

I go through 3-4 gallons of MA a week

 

[Oly]

An acid demand test would be interesting and included with the Taylor K-2006(C).
Hard to reason how a TA of 50ppm and a pH of 9.1 can coexist for long.

 

[mknauss]

No sir

your signature shows the TFPro test kit. You have the pH test block.

 

[SylKal]

Ok, wasn’t aware that the CL Br-pH tester was called a block. I’m always at the upper end of 8.2. That’s why I got a pH tester.

 

[SylKal]

No suggestions?

 

[mknauss]

I do not have any. It would seem to me something is being added to push the pH that high. And to do it without raising the TA, is very odd.

 

[Oly]

You are correct that your 2 year old plaster together with the swim pump is what is driving your pH higher. What is the TA and pH of your fill water? Look for any other products that may be driving up your pH up. You can get the acid demand reagent from TFtestkits to confirm your meters test result and acid demand. Contine watching the TA,

 

[SylKal]

Ok, sorry for the delay. We traveled to Laconia for the th anniversary of bike week!

Today’s results:
Chl- 5
FC- .5
TC- 5.5
pH- >8.2
TA— 70

Fill water:
pH- 6.8-7
TA- 190-200

 

[Bperry]

Ok, sorry for the delay. We traveled to Laconia for the th anniversary of bike week!

Today’s results:
Chl- 5
FC- .5
TC- 5.5
pH- >8.2
TA— 70

Fill water:
pH- 6.8-7
TA- 190-200

Check those FC numbers again. Looks like you swapped some values.