The first bottle we ever bought was a very small pet store version. I couldn't believe how big they were when we got them. I guess I just didn't pay attention to the size, but I think we're far from done. This stuff is very easy to use and very handy when you don't have time to buy a few gallons of distilled water at the store. I think it's about 28 drops per gallon. I admit it's difficult to get the exact number of drops but still not that bad.
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