Really revolves around how you filled the tank and what the water quality was regarding impurities and biological control
Bleach contains sodium hydroxide as well as chlorine
Great disinfectant and is easy and generally available
I hate the smell and taste of even tap water with free chlorine which you need to effectively kill microbes
Unless you have a known serious contamination problem, often self created, the peroxide safer and simpler
Don't use the same hose for black tank flush for potable and so on
1 ounce 3% per 10 gallons typically does the job
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