calcium carbonate is dropping out but have perfect LSI

[ddgautier]

pool is 13000, 87 degrees, salt, 80 TA, 7.8 Ph, 4 ch and 4 total, 300 Hardness LSI 0.00 , cya 40, salt 3000

Perfect LSI but calcium is precipitating

 

[ddgautier]

LSI 0.00 Water is clear Bottom and stairs covered in white "dust"
13000 gal salt
87 degrees
TA 80
PH 7.8
CH 4
CC 4
Hardness 300
Salt 3000

 

[reggiehammond]

What type of filter are you using?

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[mknauss]

At elevated water temperature the SWCG can create scale easier. Please use CSI not LSI when discussing on TFPC. It is available when using the PoolMath.

I would lower the pH to 7.4 which will lower the TA a bit. If that helps, target a TA of 60 or 70 to keep the CSI slightly negative.

 

[ddgautier]

What type of filter are you using?

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We have a sand filter using zeo sand. The white dust is too white to be sand.

 

[Newdude]

Collect some and put a couple of drops of Muriatic Acid on it. If it fizzes, it's calcium.

 

[ddgautier]

At elevated water temperature the SWCG can create scale easier. Please use CSI not LSI when discussing on TFPC. It is available when using the PoolMath.

I would lower the pH to 7.4 which will lower the TA a bit. If that helps, target a TA of 60 or 70 to keep the CSI slightly negative.

Thank you. I did give it muriatic acid today to do just that. I guess we will know by tomorrow. The water has gotten up to 89! Atlanta had a heat wave for 2 weeks. Thanks for confirming.