i typically connect a hose to the city water first, while the WH bypass is still enabled to flush all the pink stuff out of the lines. Then I turn the bypass off when I fill the water tank with the sanitizing chlorinated water and turn on the water pump. The water heater fills up and I open the faucets until I smell the bleach water coming through. I let it sit for several hours....then drain and flush the system once with clean city water. Been doing it this way for years....works well and everything gets sanitized.
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2014 Spartan 1032
2015 GMC 3500HD Denali 4WD/Duramax
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