Works surprisingly well! I hooked it up to my nano (10 gallon) aquarium and it works very well. I have a 1 liter bottle and it works as long as you follow the directions. If anyone uses this for the same rim tank I have, I used a notched insert and a small piece of thin box to glue it to the rim. I have expensive electronic ATO's for my other systems and I think this works pretty well as long as it's a small tank unless you want to tank a lot.
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