Single tank media filters require a regular maintenance schedule.  Another common problem is the single tank filters are over filled with media.  For example, calcite is used for water that is acidic.  A bag of calcite weighs 50 lbs.  At that weight, a conventional back washing valve will not generate enough back pressure to rinse or lift the media.  Now Imagine what happens when "Water Treatment" companies use two bags of calcite?  When too much calcite is used, it will harden and turn sold/hard like cement.  Thus becoming a useless filter.  Birm or Green Sand are other medias (that if to much used) will become non functional.  www.waterpros.net 

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