Seems to do what it's supposed to and has a good name. The only thing I would change is that there is a brand name that comes with dosing instructions (3 drops) for each gallon of water. it's for the tank. It has measurements for large amounts. So you have to estimate how much water you're going to pour, measure it, and then add a little to each gallon (I have glass cats and they're very sensitive to substances in the water, so I like purified water). before inserting, and not too little and not too much!). Which just doesn't seem too accurate and is a pain. I suppose I could sit down and work that out math, but it would be really nice to just have a top that could fall off if not squeezed too hard, and the dose listed on the label. But that's a personal preference - the product is good!
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