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Now, these photos show that sediment does gather, but it is so little that the metal bottom of the tray can be seen. Among the sediment is a sandy residue of grit from the BH media. I'd guess about half the volume of the sediment is a dusting of that grit.
I do not know if the same results would apply to a Bakki supplied from a bottom drain. Conceivably, the detritus going through it is very light weight (since picked up by the skimmer), and as a result does not settle easily, but stays in suspension to be returned to the pond. I would note, however, that each week I stir up more sediment that has settled on the bottom of the skimmer than is on the bottom of the bottom tray of the Bakki. What I stir up from the bottom of the skimmer flows to the Bakki. That is, sediment that is heavy enough to avoid being sucked into the pump moving 5,000 gallons per hour is not building up in the bottom tray of the Bakki where the presence of BH media prevents direct flow to the outlet pipes.
I do not believe in Far Infra-red Rays etc. being a factor. I expect it has to do with the type of microbes housed in the media. However, my purpose here is just to report what I found.
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