Decontaminating water tanks
Here is what I do.
1. Fill tank then drain it. Remove any filter you may have.
2. Pour in hydrogen peroxide - I use one teaspoon/gallon of tank capacity.
3. Refill tank and let sit a day. Be sure to pump this water into all lines before sitting.
4. Drain and refill twice. Replace filter if you have one. I use an inline charcoal filter from Lowes.
You''re ready to go. One exception is if you have a lot of algae built up then you may have to pull hoses and clean them. I clean the hoses by pulling soaked cotton balls on strings (Hydr Perox) through each line until clean. Do this after step one if you need to do it at all.
Also, I winterize my tank with the same stuff plus non-toxic anti-freeze.