Sandy Chan and Catherine Paul, researchers in Water Resources Engineering and Applied Microbiology at Lund University, have investigated the sand filtration and discovered that old filter with microorganisms is a major explanation for why older plants work better than new. Further confirmation that a biofilter keeps over time.
Raatec:s BioBox has now been in operation in many places during 18 year with only satisfied customers and that this article describes also our filters keep the generations.
In other words, a good investment that keeps a long while.
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