Can't keep PH down

[mikesig83]

Hello Friends,

Here are my #s today:
FC 8.5 (No CC)
PH 8.0
TA 100
CH 260
CYA 50

Here were my #s two days ago:
FC 6 (No CC)
PH 7.5
TA 90
CH 260
CYA 50

I've added MA (31.45-20 baume) three different times this week (maybe 8 cups) so I am totally lost as to why TA went up. It got the PH down for a few days and it is immediately back to where it was before. I did have Stonescapes MiniPebbles installed to replace my old plaster in December 2019. I would think by now the curing process is over and the new plaster would not be messing with PH, but that is the only thing I can think of messing with my PH/TA. I also haven't added any new water during this time period (no rain either here in North TX).

Any ideas? Thanks all!

 

[thetekgeek]

I see you have a waterfall in your signature, have you been running it a lot lately? Aeration of the water will drive the PH upwards.

 

[mikesig83]

I see you have a waterfall in your signature, have you been running it a lot lately? Aeration of the water will drive the PH upwards.

Great question: No, we haven't been running it and have had very little use of the pool this week.

 

[Richard320]

The pH will naturally rise. The TA is within the margin of error on the test.

I see nothing alarming. Add some more acid to lower pH. I had to drive my TA down to about 60 before things settled down.

 

[mikesig83]

The pH will naturally rise. The TA is within the margin of error on the test.

I see nothing alarming. Add some more acid to lower pH. I had to drive my TA down to about 60 before things settled down.

Thanks