These air stones are decent. Not great, not terrible. They don't seem to be constructed really well which concerned me initially but ended working okay. A few of the stones get more air toward the back of the stone (where the air comes in) and almost none toward the end. The ones that get even air distribution work great. I guess its a good deal for the price.
This does what the big 4-5 dollar stones u might find locally. I give it good ratings on oxygen amount, size, and price. A little brittle I dropped one barely and it quickly broke so their not as tough as ur large stones but they perform as well just require more care
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