Alumina Airstone - 1-1/2 in x 1-1/2 in x 9 in - 3/8 in barb
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3 times stronger than white silica airstones - Alumina airstones are ideal for large aeration situations like ponds. Pro-Glass design produces a finer bubble with no increase in pressure. Higher density means they're self-weighted and easier to add to any application. Cleanable with muriatic acid or chlorine. More resistant to ozone than standard air stones.