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Tide Marks


Pilotman

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If it’s a hard whitish coating 2-3-4 mm thick its calcium, use a Stanley knife blade, scraper or sharp wood chisel to gently but firmly scape it away then use something like CLR clear and/or a phosphoric acid based brick/stone/concrete cleaner and a stiff brush.

Less than that it’s likely just scum so maybe just the phosphoric acid cleaner with a nylon scourer (don’t forget rubber gloves) 

You'll probably need to at least lower the water level.

 

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