This is a fairly simple product that either works or it doesn't. Right out of the box, it disperses air bubbles very well, which is what you need. A nice column of bubbles moves more water. This is the purpose of the air stone. Circulate water from bottom to top. They work very well and there are a lot of them. This creates such an air column that compost tea can also be made from it. Very well made, good product.
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