TA is 100, not sure if it is okay or needs to be lowered?

[NtxMelanie]

My new pool is finally clearing up and my readings are

FC 2.5
CH 405
TA 100
CYA 30
PH 7.6

I’m going to add CYA to get it to 40, but do I need to lower the TA? The trouble free Pools chart says that my ideal TA is between 60 to 80, but the TF-100 kit says 100-120 for chlorinated pools.
If TA does need to be between 60 to 80, will the addition of CYA lower the ph enough to help with elevated TA? If so I will just add stabilizer and retest both.

5500 gallon inground plaster spa/pool combo, intelliflo vsf pump, inline chlorine with ozone, TF-100 testing kit

 

[mknauss]

Manage your pH in the 7's and the TA will manage itself.

 

[NtxMelanie]

Manage your pH in the 7's and the TA will manage itself.

Does that mean if my PH is 7.6 I don’t need to worry about the TA readings at all?

 

[mknauss]

Correct. When you are going to add acid due to pH rising to 8, then test TA as you need the current TA level for Poolmath to give you how much acid you need to add.

Only caveat to this is if your CH rises to above 500 ppm or so. Then CSI starts to be of a concern and TA is one way to manage that.

 

[Toxophilite]

With the new plaster, your pH will need constant adjustment. I'm on my 16th gallon of acid in as many weeks, not counting the gallons they started up with, and I manage pH between 7.6 and 8.0. Climbs up to 8.0 about 3rd day after a pH lowering. My TA started at 120, but the last 3 weeks have had readings of 90 TA, so making progress.

 

[NtxMelanie]

With the new plaster, your pH will need constant adjustment. I'm on my 16th gallon of acid in as many weeks, not counting the gallons they started up with, and I manage pH between 7.6 and 8.0. Climbs up to 8.0 about 3rd day after a pH lowering. My TA started at 120, but the last 3 weeks have had readings of 90 TA, so making progress.

Thank you, that’s good to know!