Calcium hardness & plaster pool - how low is too low?

[aztodd]

My CH is 275, which is on the low end of the recommended range for a plaster pool. I have softened fill water, so it's not going to rise on it's own, it's actually fallen slightly since the beginning of this season.

Two questions:
Is this CH level range ok in the long run?
How low is 'too low' that should trigger me adding something to raise the CH?

Thank you!

 

[mknauss]

Let your pH ride higher. Do not lower it below 7.6.

You could just use non softened water for a week or so and your CH will come up some.

 

[aztodd]

Thanks, my pH will come back up shortly, usually I try to keep it around 7.8 but I've been lowering my TA from 110 to now 70 because I was having trouble with constant high pH levels (8.0 to 8.2).

My questions still stand though - do I need to raise my CH from the current level? is ~350ppm a more preferrable number to sit at for plaster pools?

 

[mknauss]

It is. So up to you. Easiest is to just use non softened water for a while to add some calcium.