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Good question, Papabear. If you look at my pre-experiment set-up I have an in-ground filter that is being fed purely by mid-water. I have used this filter to assess the amount of sedimentation AFTER water is being fed thro' the BS/BH. I must agree that the mid-water feed to this filter is an admixture of unfiltered water as well as post-BS/BH filtration. I would expect that over time sludge accumulation would decrease if BS/BH performs as reported by some. Not in my pond. The sludge accumulation in this filter is way too much to be ignored. Perhaps those who reported that BS/BH gets rid of mulm may see some sedimentation if they run the post-filtered water thro' a long channel. My bet is they will see significant sedimentation. Anyone care to try?
Cheers.
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