Works as well if not better than some of the much more expensive ATOs. It's a very simple design that works with no moving parts, electricity or pumps. I'm glad I bought it for my nano aquarium because it keeps my salinity very stable. It fits easily in a standard 20 ounce or 1 liter bottle. It also has additional parts for customizing rimmed or rimless tanks, which I thought was a great addition for the price.
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EcoBio-Block Stone: Natural Water Clarifier & Odor Remover for Aquariums (Medium) - Treats 15-40 Gallons Efficiently
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