Hayward Perflex Extended-Cycle D.E. Filter - EC75A

SKU:10001218
$1,099.99

***7 lbs D.E. required***

Features/Benefits

  • Exclusive bump handle activates the mechanism causing the Flex-Tubes to instantly and uniformly clean themselves of dirt and filter powder
  • Self-venting design automatically expels any air that may be present in the system
  • Proven, patented Flex-Tube filter elements efficiently reuse the filter powder and dirt mixture forming a fresh filtering surface
  • Combination pressure gauge and threaded inspection/service port is easy to read and remove when filter needs cleaning
  • Heavy-duty filter tank injection-molded of high-strength for dependable, corrosion-free performance
  • Integral check valve prevents system backflow whenever pump is off 


D.E. – The Water Polisher 

The D.E. filter is the most efficient type of pool filter on the market. It can trap particles down to 3 - 5 microns; well below what the naked eye can see. As with sand filters, the pressure gauge indicates a need for backwashing when it reads 8 - 10 lbs. higher than its clean reading. After backwashing a D.E. filter, a new application of D.E. filter powder is added to the filter by pouring into the skimmer. An annual breakdown of the filter is necessary to thoroughly clean D.E. filter grids. 

Diatomaceous Earth — also known as DE, TSS and Diatomite — is a naturally occurring, soft, chalk-like sedimentary rock that is easily crumbled into a fine white to off-white powder, with a particle size extending from less than 1 to over 100 microns, but typically around 2 to 10 microns. This powder has an abrasive feel, similar to pumice powder, and is very light, due to its high porosity. The typical chemical composition of diatomaceous earth is 86% silica, 5% sodium, 3% magnesium and 2% iron.The most common use (68%) of Diatomaceous Earth is as a filter medium, especially for swimming pools. It has a high porosity, because it is composed of microscopically-small, coffin-like, hollow particles. 

A D.E. filter requires that the operator (you) add D.E. powder to coat the filter grids inside of the filter tank. This widely available, inexpensive powder is mined and is actually the microscopic fossilized exoskeletons of tiny Diatoms, an ancient, sub aquatic creature. Under the microscope, these skeletons appear to be tiny sponges. This is where the dirt gets trapped in your filter. The powder, which is added at your skimmer, dissolves in the pipe on its way to the filter tank. When it reaches the grids, which are covered with a nylon type of fabric, the powder stops, coating the grid. Grids are also called Elements or Septums. The water continues to pass through, first through the powder, then the fabric covered grid. As the water passes through the D.E. and enters the grid it leaves the dirt, trapped in the D.E. powder "cake" or coating. 

The D.E. powder is what filters your pool water in a D.E. filter. Do not operate your pump without having the D.E. powder coating the grids, or you will see your pressure rise very quickly, and if left in this manner the grids could become damaged. As the pressure gauge on a D.E. filter increases, flow rate decreases. Eventually the flow rate will allow the water quality to suffer. You will need to backwash the filter to remove the D.E. that is clogged up with the dirt. After backwashing thoroughly, add new D.E. powder to the filter through the skimmer. If using biguanides (Soft Swim or Baquacil) you will need twice annual, very thorough cleaning to prevent it from gumming up. All D.E. filters should have this done at least once per year. Thorough cleaning is accomplished by turning the pump off and draining the filter. Remove the tank top half, and remove the grid assembly. Hose the grid assembly thoroughly. If you want to do an extra good job, after hosing, soak the assembly in a trash can filled with water and a filter cleaner product. (or use TSP {trisodium-phosphate} from the hardware store). Rinse thoroughly before reinstalling grids into tank.

When backwashing a D.E. filter, do the "process" several times. That is, backwash until water runs clear, move the multiport valve to FILTER and run it on filter for a 5 - 10 seconds, and backwash again until it runs clear, etc…do this 2 - 4 times. Remember to always shut off the pump before turning your multiport valve or your push-pull valve. Each time you go through the cycle of filter/ backwash/ filter, you will get more dirt/ D.E. out of the filter, giving you a better, more thorough backwash. 

Also important in ensuring an effective backwashing is to make sure skimmer baskets and pump baskets are clean to allow for full flow entering the filter.

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