Dirt "stains" in plaster

RMcGirr83

Gold Supporter
Nov 19, 2018
970
Tuscola, TX
Scrubbing the pool and I can't seem to remove some dirt marks from the plaster (some are streaky looking and some just marks). CH is a bit high at 475 but all other readings are within scope (TC 2.2, pH 7.6, ALY 94, CYA 30).

Any idea on why this happened and how I can get the "stains" out. TIA.
 

duraleigh

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Mod Squad
TFP Expert
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LifeTime Supporter
In The Industry
Apr 1, 2007
34,518
Sebring, Florida
A pic(s) would help but it sounds as if you have calcium scale. Removing that scale will release the dirt but first it needs to be correctly identified. What is you Calcium test result?
 
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