Calcium scale above water line? Removal?


Active member
Jul 13, 2020
Charlotte, NC
Hi pros- we have some calcium scale (at least I think that’s what it is) around the stone/grout by our spa waterfall. This is the only place I’ve noticed any scale. If it is calcium scale, do I use 100% Muriatic acid to remove it? A pumice stone doesn’t seem to be doing anything.
1. If I DO use Muriatic do I apply it safely without it splashing or spraying?
2. Should I be concerned about all the scale falling into the pool water?


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Texas Splash

Mod Squad
TFP Expert
LifeTime Supporter
Jun 22, 2014
Texas, San Antonio/Marion, South-Central Area
Pool Size
Salt Water Generator
SWG Type
CircuPool RJ-45 Plus
Mixing some muriatic acid and water in a spray bottle in about a 3:1 ratio (water to acid), combined with some brushing should do the trick. If teh scale is stubborn, you can try a 50/50 mix. It won't hurt anything when it runs down into the water.


Gold Supporter
Aug 26, 2016
Berks County, PA
Could also use "Acid Magic" which I see from some quick research has been discussed on TFP several times. Safer to handle and store, 90% less fumes, and far less caustic - at least that has been my experience in using it to clean deposits off my coping. It was suggested to me by the company that renovated my pool. Fairly certain I've also used it for the calcium scale you are referring to. Not sure what the water ratio is anymore, but directions are on the container. I put the mix in a spray bottle that was advertised as being suitable for use with chemicals and found the stuff really easy to work with. After spraying it on the coping - I seem to recall you let it sit for several minutes and then I just hosed it off into the pool water. As TS mentioned, no problem with doing that.
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