Calcium or water line build up

justinS

Bronze Supporter
Jan 25, 2018
150
tucson/az
Good morning,
My pool is one year old on Mother’s Day. I have a faint line starting. I live in southern Arizona, Tucson.
What has everyone done to help this?
I saw an oven mitt looking thing at pool store?

Thanks
 

mknauss

Mod Squad
TFP Expert
May 3, 2014
16,034
Laughlin, NV
Are you managing your CSI - Calcium Saturation Index? Keep it between -0.3 and 0.

Even with that, you will get calcium build up at the water line over time.
 

mknauss

Mod Squad
TFP Expert
May 3, 2014
16,034
Laughlin, NV
You minimize it by managing the CSI.

I find that I get a little more build up as I approach 800+ ppm CH. I typically exchange my water to fresh about that time. When I do, I keep the CSI negative and the majority of the scale gets dissolved back into the pool water.

Many here also use pumice stone or a mild acid solution and a stiff brush. Eye protection is paramount. If the scale gets bad enough, you can hire a service to kieserite blast.
 
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