Integrated Check Valve prevents backflowĬonsidered the standard grid design, the curved grid assembly may also be the most popular, or certainly the most used grid type.Remove Flex-Tube Nest annually for cleaning.40 sq ft filter area, with 120 Flex-Tubes.The Perflex filter is not backwashed, but is flushed and drained periodically. This can result in longer filter cycles, or times between changing the DE powder. Another unique feature of the Perflex line of filters are their unique ‘Bump Handle’, which is used to bump the Flex-Tube Nest assembly, sloughing off and mixing the DE powder and dirt, to reduce filter pressure.
Having over 100 tubes creates a large amount of surface area (40 sq ft) in a small package, called the Flex-Tube Nest, shown here. Called Flex-Tubes by Hayward, and called ‘fingers’ by most everyone I know, these 16in long tubes are about 1/2in wide and arranged in a concentric circle pattern. This style of DE filter grid is patented by Hayward, and used on the Perflex line of DE filters. These Grid Styles are ‘Finger’, ‘Curved’, ‘Straight’ and ‘Cartridge’. Grids are not the filter, but serve as the ‘holder’ for the DE powder, which does the filtering of the water. DE grids are the elements inside the tank which are coated with DE powder. If you are in the market for a new pool filter, today’s blog post is a comparison of DE pool filters for inground pools of 20-50,000 gallons.ĭE pool filters are available in 4 grid styles. This can allow you to run the pump less, or use fewer chemicals, clean up adverse water conditions fast – or avoid them altogether. filter is the way to go.ĭiatomaceous Earth pool filters remove particles under 3 microns, which far exceeds the capability of sand (20-40 microns) or cartridge (10-20 microns) filters. Inground pools can use sand or cartridge filters, but if you want the best filtration possible, a D.E.
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