Thank Goodness For Pool School! CH Question

[Zeppelin_Heaven]

Yay for pool school! Before the pool water was cloudy, dirty and numbers extreme. My way would have taken the entire summer to correct, but reading the Pool School section I accomplished a lot in a week! Currently, my water appears to be balanced, clean and sparkling!

Specifications:
Viking Pool (ceramic fiberglass), 9000 gallon, equipped with a s.w.g.

Water:
FC - 4
TC - 4
pH - 7.2
TA - 60
CH - 160
CYA - 60

I see my numbers are normal, except CH. Maybe the CH is low because I mostly filled the pool with soft water from my house. What do you pool experts think?

 

[JohnT]

What kind of pool do you have? Vinyl pools don't care about CH unless you have a heater. If you have a heater, follow the heater manufacturer's recommendation for CH.

 

[Butterfly]

Hi,

It would be helpful to have all your pool and equipment info in your sig. Go to User Control Panel, upper left, select Profile, then edit Sig.

Recommended level for CH for fiberglass w/SWG is 220-320.

Here's a thread w/info that may be of interest: stain-keeps-coming-back-in-my-fiberglass-pool-t5446.html?hilit=cobalt%20stain%20fiberglass

 

[PaulR]

What does your SWG manufacturer recommend for CYA? 60 might be a tad low.
--paulr

 

[Zeppelin_Heaven]

What does your SWG manufacturer recommend for CYA? 60 might be a tad low.
--paulr

Goldline manual says 60ppm minimum.

 

[Zeppelin_Heaven]

What kind of pool do you have? Vinyl pools don't care about CH unless you have a heater. If you have a heater, follow the heater manufacturer's recommendation for CH.

I did the saturation index and my pool water is actually corrosive. Increasing the calcium levels will help off set the corrosive environment.

 

[Butterfly]

Would you mind adding "fiberglass" to your sig? :lol:

Thanks!

 

[PaulR]

If that's a cartridge filter the CYA is probably okay. If it's DE or sand then you'll lose some water backwashing and you might want to nudge up the CYA to keep it in range.
--paulr

 

[Guest]

Bump your CYa up to 80 ppm (you will get better pH stability!
water-balance-tips-for-a-swg-t3663.html
Bring up your CH. It will help minimize staining that fiberglass pools are so prone to and also help eliminate cobalt spotting which happens as the gelcoat ages.

 

[Guest]

What kind of pool do you have? Vinyl pools don't care about CH unless you have a heater. If you have a heater, follow the heater manufacturer's recommendation for CH.

I did the saturation index and my pool water is actually corrosive. Increasing the calcium levels will help off set the corrosive environment.

The CSI is actually one applicable to plaster surfaces. It does not predict corrosion on metal surfacts. However low calcium can cause other problems with fiberglass pools such as cobalt spotting and higher incidence of staining.

 

[Zeppelin_Heaven]

Okay so raise the CYA to 80, which is fine because I have leftover stabilizer from my last application.

Now I need to buy calcium chloride...

All my other numbers good?

 

[JasonLion]

Yes, the other names are all reasonable. You are going to need to raise the TA just a little fairly soon, but I don't see any need to do that right away.

 

[Guest]

Really? I was celebrating when I finally got my CYA down to 60ppm. Last year it was over 150 at one time.

What kind of pool do you have? Vinyl pools don't care about CH unless you have a heater. If you have a heater, follow the heater manufacturer's recommendation for CH.

I did the saturation index and my pool water is actually corrosive. Increasing the calcium levels will help off set the corrosive environment.

The CSI is actually one applicable to plaster surfaces. It does not predict corrosion on metal surfacts. However low calcium can cause other problems with fiberglass pools such as cobalt spotting and higher incidence of staining.

 

[PaulR]

Really? I was celebrating when I finally got my CYA down to 60ppm. Last year it was over 150 at one time.

With a SWG you want to run with a higher CYA, helps the whole system run more efficiently. Because chlorine gets added automatically the level will tend to fluctuate less and so you can run it "closer to the line" than you really want to do with manual addition of chlorine.
--paulr