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21 ounces to 100 gallons of water means (21/100) = 0.21 ounce per gallon of water.

The proper amount of chemical is only 0.16% of the amount of water it goes into. It's hard to get the correct concentration for small batches.

This is probably why they give you the instructions in terms of 100 gallons ... it would be tough to measure 0.21 ounces accurately.

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Q: If you put 21 ounces of a chemical per 100 gallons of water how many ounces would you put in 1 gallon of water?
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