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1 gallon of 30% hydrogen peroxide for every 500 gallons of water, how much will I need at 35%?

I have 35% hydrogen peroxide and need to disinfect a water tank

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If something calls for 1 gallon of a 30% hydrogen peroxide solution per every 500 gallons of water and you have a 35% hydrogen peroxide solution, you can either add more water or use less solution. If you want to use less solution, use about 0.86 gallons, or 13.7 cups, for every 500 gallons of water. If you want to use 1 gallon of the 35% solution, mix it with 583 gallons of water.

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That 5% isn't a real big deal. I really can't think of a way to calculate how much more water. Empty out 5% of the bottle and dilute it with water, then continue on with the 1 gallon per 500 gallons.

I, personally, would just throw the whole 35% bottle.

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Throw in***
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