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But what about debris that is too large to get into the gravel? This would normally include outside environmen… | Outdoor ponds, Pond landscaping, Fish pond gardens
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pondtrademag.com
So you (Still) Want a Crystal Clear Pond: Revisiting Undergravel Filtration - POND Trade Magazine
I’m happy to take this opportunity to expand on what I wrote four years ago about undergravel filtration.
