Does low ph affect plaster?

[consoleman]

I have always kept my ph from going over 7.6 since getting new pebbletec plaster to avoid scaling i think.

When it rains i tend to go a little heave on the MA and get the ph al low as 7.0, maybe lower. What effect does that have on my plaster?

Here is what i keep my levels at:
Cya 50
Fc 6
Ta 70 to 100
Ch 200
Ph 7.2 to 7.6

 

[jblizzle]

Plug all your test results in the PoolMath and look at the calculated CSI. That will be an indication of any issues for your plaster.

 

[consoleman]

Plug all your test results in the PoolMath and look at the calculated CSI. That will be an indication of any issues for your plaster.

Its says its at -0.59.
Other threads indicate to leave CSI between -0.3 and 0.3 for plaster pools be safe from etching/piting and calcium scaling.

CSI seems to be largely affected by Ph but CH and TA also affect CSI. So my understanding is:

Negative CSI = etching/piting
Positive CSI = calcium scaling

 

[consoleman]

If i am able to keep my CSI range between -0.3 to 0.3, do you see anything wrong with keeping my CH around 200?

Pebbletec recommends CH to be from 150-300 while TFP recommends 250-350.

 

[Richard320]

If i am able to keep my CSI range between -0.3 to 0.3, do you see anything wrong with keeping my CH around 200?

Pebbletec recommends CH to be from 150-300 while TFP recommends 250-350.

No, because CH will climb from evaporation and refills.

You need to go play with poolmath some more and see how much a role temperature plays in CSI calculations, too. Figure out what will happen if the water gets hotter or cooler.