Do I need to bump up CH?

[dford8583]

I have a vinyl liner pool
I Tested and have the following
FC 6.0 ppm
PH 7.5
TA 90
CH 80
Temp 60-70 F
CSI -0.7 to -0.6
Taylor water gram indicates -0.3 or lower may be corrosive to concrete, plaster, or metal surfaces.
Looks like bumping up my CH to 200-250 will put me in a better range for my expected pool temps. Is this the correct move or is -7 ok for vinyl pool?

 

[wireform]

I don't think you need 250 for the vinyl pool. Let it go for now and bring it up when the temps climb and it's needed to control CSI

 

[YippeeSkippy]

I like to play around with the classic web version of PoolMath (found at the bottom of this page) where you can enter your results in the "Now" column, then next to it play around with results in the "Target" column. It makes it easy to see how different changes can affect things.

In a vinyl pool, CSI is rarely that vital, unlike a plaster pool. But you do want to avoid low pH which can make a liner brittle.

Maddie

 

[dford8583]

What about metal components in pump and ladder?

 

[YippeeSkippy]

Avoid overly acidic pH there too. Overly acidic would be those with pH <6.8

 

[Katodude]

But just to confirm, CSI does not affect thinks like heaters, ladders, etc.?? Just pH?