Lee's Discard-A-Stone, Fine, 100 Bulk
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<b>[Product Information]</b><br>
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<li>Makes fine bubbles</li>
<li>They are an excellent aeration device for use in under gravel filters, corner filters</li>
<li>Discard-A-Stones are disposable air diffusers with reusable inserts for attaching airline</li>
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