Rough brown patch on bottom of pool

[MJL2325]

Hello TFP,
Opened to a green pool this year and I am a new pool owner, I was dumping a bunch of calcium hypochlorite shock packs in the pool. Our pump broke, still added more calcium hypochlorite to shock the pool until we got the pump fixed. I didn’t know any better but it hind sight I think this was a mistake.
Now water is clear but there is this rough tan patch bottom of pool. I’m figuring this is calcium buildup from using that type of shock. Has anyone encountered this and how did they fix it? Pumice stone on end of pole? (Will be difficult to cover this large an area). Firm brush? Muriatic acid and then brush and pumice?
Thanks for your help!

 

[ajw22]

What test kit do you use?

Post a full set of water chemistry from YOUR test kit in the format:

FC
CC
pH
TA
CH
CYA
WATER TEMPERATURE
CSI

Pool Care Basics Archives

Your one-stop shop for all things TFP to include: ABCs of Water Chemistry, Recommended Chemicals/Levels, Test Kits, Troubleshooting, and much more!

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[MJL2325]

I use the TF 100

FC 7
CC 0.5
pH 7.5
TA 110
CH 300
CYA 80

 

[ajw22]

You use PoolMath?

Plug in your trst and calculate your CSI.

 

[MJL2325]

It says CSI is zero currently
But—the first time I did the pool math numbers it said 0.6 CSI (that was about 2 weeks ago)

 

[ajw22]

0.6 CSI could have caused the scaling...

Calcium Scale - Further Reading

www.troublefreepool.com

 

[MJL2325]

I hadn’t paid attention to the CSI before, thanks! Hopefully with keeping it low over time it will improve the scaling