sanford Posted January 11, 2022 Share Posted January 11, 2022 The LFS in my area stocks Estes brand gravel that advertises an environment friendly resin coating on the gravel. I'm not sure what advantage resin provides, but I am even more curious about whether the resin coat reduces gravel porosity to a point where the gravel is less effective as bio-media for an under gravel filter. Anyone have any experience with this? Link to comment Share on other sites More sharing options...
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