CSI is -.42, Should I Raise It?

[revitup]

I’m wondering, once again, if there’s something I should be doing to raise my CSI. It’s at -.42 right now. On the one hand I’m understanding that it isn’t that important given the pool is FG but other info seems to indicate I need somewhere 0 to -.3 to protect the salt cell from scale or for some reason protect my HP.
if I need to raise it what is the best way? Increase TA? Increase CH? Increase PH? I really hate to mess with TA or PH as my PH is really dialed in right now and is rock steady at 7.5 - 7.6. In fact all my chem levels have been pretty much perfect (as I see it). Of course everything is visible in my logs.
I am in the process of bringing my FC down a little as I had it raised the last couple of days (I had a possum take a swim).

 

[revitup]

Just to make it a little easier
Fc 12. 5
Cc 0
Ph 7.5
TA 70
Ch 350
Cya 70
Salt 3000
Temp 90

 

[ajw22]

Your CSI is fine for your setup. A positive CSI can lead to scaling in your pool or SWG. But you can't have too negative a CSI.

 

[Bperry]

ph may rise on its own and bring it closer to 0.

 

[DeanP66]

When I plug in your #'s, I get -0.28. Check your calculations again. Those appear to be perfect.

 

[mgtfp]

I agree with the previous poster, I also get -0.28.

 

[revitup]

When I plug in your #'s, I get -0.28. Check your calculations again. Those appear to be perfect.

You are correct. I misreported TA. It’s 60, not 70.
Also, going back in my logs, my input PH was actually 7.46 (from my meter) although Poolmath rounds the PH it shows to 7.5.

 

[Rancho Cost-a-Lotta]

Letting your pH rise a bit and stay will bring your CSI. 60 TA is about as low as you want to go. That said, your chemistry looks great!

 

[revitup]

My PH really never moves. I have a partial jug of muriatic in the shed with cobwebs on it. I think I’ll add a little baking soda to bring the TA up 10.
Thanks for the input all. I value all your advice.

 

[Rancho Cost-a-Lotta]

My PH really never moves

Lucky!