It won't hurt your water heater, you don't leave it in the system long enough to do damage. I have done and need to bleach treat my private well at home and never worried about bleach in the wh.
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Richard & Jill
2014 Flagstaff 832IKBS Classic Super Lite
2018 Silverado 1500 Crew Cab Z71 4WD All Star Edition
Camping since 1989, Seasonal since 2000.
Car Shredder Op/Tech, Scrap Metal Recycling - retired
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