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Old 01-20-20, 06:06 PM   #9
menaus2
Apprentice EcoRenovator
 
Join Date: Feb 2011
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I occasionally throw a gallon of bleach in the tank and call it good enough. Both of my hot water systems I've built have a pex coil type heat exchanger and I don't think the water going through the HX is in it long enough to grow anything. Open to better chemical suggestions!
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