Once the pressure for a single gauge operation exceeds 10 psi higher than the starting pressure of the cycle, the filter must be cleaned (backwashed). The water that leaves the filter through the output port is then returned to the pool.ĭuring a filter cycle, suspended dirt in the passageways of the DE cake causes an increase in pressure and a decrease in flow. ![]() ![]() Suspended dirt gets trapped on the DE powder as the cleansed water passes through. This action collects the DE on the bottom of the tank and depositing it on the grids. The water is then directed to the bottom of the tank without touching the grids. Water enters the filter tank through a series of valves or a multi-port valve. The synthetic cloth serves as a support base for the DE cake and the grids are held together by a collection manifold and a support bracket. The filter’s grid assembly comes in different sizes and shapes and is made of plastic covered in synthetic cloth. An air relief valve on the top of the pressure DE pool filter allows internal pressure to release before servicing the equipment. The system will have water inlet and outlet lines located on the bottom half of the filter tank. There is also a seal between the two halves consisting of an O-ring or a gasket. Pressure DE systems have vertical filter tanks, where two halves are held together by compression clamps, bolds, or locking screw closure rings. Certified Pool Operators® require extensive knowledge of all pool filtration systems and DE filtration is a great jumping-off point. This week, we’ll look at the pressure DE pool filter, how they work and how to properly maintain them. It is a good sign that your filter is dirty and needs to be cleaned.In our last article, we went over essential information on vacuum DE pool filters and their uses at a swimming facility. When your pool appears to be dustier than normal and unable maintain a clean pool surface. Another good sign to look out for is when your pool is no longer able to keep up with the debris entering your pool. If you are backwashing on a regular basis, and the pressure gauge continues to read 4 to 5 psi higher than the original starting pressure, this is a good sign that your grids needs to be cleaned. ![]() When the pressure on your gauge reads 8 to 10 psi higher than the original starting pressure, manufacturers suggest that DE filters (DE grids) should be cleaned. The pressure on the DE filter will increase as dirt and debris are removed from your pool. Some telltale signs that your filter may need more frequent cleaning can come from checking the pressure gauge, located on top of your filter. Staying consistent with both of these practices (backwashing and grid cleaning) will help you maintain a healthy and sanitary DE filter, so you can enjoy your swimming pool. Disassembling and cleaning your grids, by hand, (every 3-6 months) is the best way to ensure all the bacteria, dirt and debris are removed from your DE filter. Backwashing does help remove dirt and debris from your DE grids, but it is not the best solution, as it does not remove all materials. Backwashing your DE filter is a good way to keep the DE filter clean in between removal and cleaning of the grids. ![]() Backwashing is the process of reversing the flow of water in your DE filter, and flushing the contaminated water out the waste line.
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