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Old 08-12-2016, 03:48 PM   #5
HeadMistress
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City: AR
Join Date: Jul 2009
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It does attack metal, but any consequential damage from the recommended 10-12% dilution would require very frequent use and still would take a long time. Plus you wouldn't be sending it into totally empty tank even if you'd just pumped out 'cuz there'd still be an inch or so of water or waste at the bottom of it. Boat owners and yards have been using muriatic acid to clean sanitation plumbing for decades, and Raritan's instructions for cleaning the LectraSan/ElectroScan called for the 10-12% solution of muriatic acid until they began marketing the more eco-friendly Sew Clean as their own private label brand "C.H." But if you're not comfortable using it, spend the extra money for Sew Clean.

Btw...found these directions for muriatic acid use in an article by Don Casey:

Pour two cups of the diluted acid (be sure to CAREFULLY read and FOLLOW directions for mixing!) into the bowl. It will fizz as it reacts with the calcium deposits on the bowl valve. When the fizzing stops, pump the head--intake closed--just enough to empty the bowl. This moves the acid into the pump. After a few minutes pump again to move the acid into the discharge hose. Let it sit a few more minutes before opening the intake and thoroughly flushing the toilet and lines. The acid is "used up" as it reacts with the calcium, so heavy scaling may call for more than one treatment. Scale and salt also find their way into the anti-siphon valve in the discharge line. Remove the valve and soak it in warm, soapy water to dissolve deposits that could be holding it shut or open.
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Specializing in marine sanitation since '87.
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