A DE filter is a diatomaceous earth (I hate it when people throw out abbreviations and expect me to know what they are talking about but I can never spell that without looking it up... sorry) also known as a Diatom filter in the aquarium world. Diatomaceous earth is a fine powder of dead microscopic diatom organism shells. The shells have a ton of small holes through them. A DE filter has a filter bag that you cover with the diatomaceous earth powder (pump water through the bag and add DE powder to the water). The small pore size of the DE and huge number of them make for an excellent filter. I guess DE filters are used in beer and wine filtering as well as other food grade liquid filter applications. Swimming pool DE filters are also very popular. It has been stated that DE filters are fine enough to filter ICH and other bacterial/fungal based diseases from the water. I can testify that my DE filter cleaned up a green water outbreak in a couple of hours.
It is a great tool for clean water fanatics... But I don't run mine continuously, just a couple times a month.
It is a great tool for clean water fanatics... But I don't run mine continuously, just a couple times a month.