Durafilter Glass Filter Media

Features

• Improves water clarity
• Removes particles as small as 5 microns
• Pay back period of less than 12 months
• reduced chemical usage
• Less wastage of heated and treated water
• Resists bacterial contamination
• Longer lasting (no need to replace every 5 years)
• Chloramines greatly reduced
• 50% less water required to backwash
• 10% less media required than sand

Sand filters consist of a large tank, made of fiberglass, concrete or metal, containing a thick bed of special-grade media.

During filtering operation, dirty water from the pool comes in through the filter’s inlet pipe, which leads to the water distribution head inside the tank. While gravity pulls the water down through the sand, the tiny media particles catch any dirt and debris. At the bottom of the tank, the filtered water flows through the pick-up unit and out the outlet pipe.

Over time, the collected dirt and debris in the media slows down the water flow. Pressure gauges at the filter inlet and outlet give the pool custodian an idea of the blockage level inside. If gauges show much greater pressure on the inlet pipe than the outlet pipe, the custodian knows there’s a lot of collected debris in the media. This means it’s time to backwash the filter. To backwash, the custodian adjusts a number of valves to redirect the water flow. He or she closes the return pipe leading to the pool and opens the drainage pipe. He or she adjusts a valve at the filter to connect the pipe from the pump to the outlet pipe and connect the drainage pipe to the inlet pipe. With this arrangement, water from the pump pushes up through the media, dislodging the dirt and debris. At the top of the filter tank, the dirty water flows out through the inlet pipe.

In place of a sand filter, some pool systems use a diatomaceous earth filter or a cartridge filter. In a diatomaceous earth filter, water from the pool passes through filter grids coated with diatomaceous earth, a fine powder made from the chemically inert, fossilized remains of sea organisms called diatoms. In a cartridge filter, dirty water passes through a filter made out of polyester cloth or corrugated paper. Instead of backwashing, you simply remove the filter and hose it off. After a few years, it’s time to discard the old filter and put in a new one.