Hayward Perflex Inground Diatomaceous Earth Filter

The Perflex Extended-Cycle DE filter series cleans pools fast - removing particles as small as one micron the first time through. That's because Perflex incorporates a patented Flex-Tube design that works in combination with DE (diatomaceous earth) filter powder to produce the clearest, most sparkling water possible.

The exclusive Perflex Extended Cycle gives you long filter cycles between cleaning - up to eight weeks depending on pool size and use. Because the same filter powder is used over and over again, Perflex is a real work saver. And, it only takes minutes to extend the cycle.

Perflex filters stretch your dollars too! Since Perflex cleans without backwashing, you save hundreds of gallons of treated pool water. Plus, Perflex saves on electricity because its efficient design offers less resistance to flow and produces more filtered water with less pump horsepower.

When conventional filters need backwashing, Perflex only needs "Bumping". "Bumping" repositions the dirt within the filter so the flow of water is not impeded. This is called Regeneration, because flow and pressure are restored, extending the filter cycle. When the dirt-holding capacity of the Perflex filter is reached, cleaning is simple. Just "Bump" and drain.

How it Works:
Perflex filters use diatomaceous earth filter powder (commonly called D.E.), and is the most efficient dirt remover known. It will even remove microscopic dust and pollen. Unfiltered water enters through the bottom connection in the filter tank, flows upward through the Flex-Tubes, and returns to the pool via the outlet in the filter head.

When the filter is initially started, diatomite filter powder is fed into the system, usually through the skimmer. This is precoating. As the water passes through the Flex-Tubes, the filter powder is automatically deposited on the outside of the Flex-Tubes, forming the working "filter surface". Similarly, dirt in the water is stopped on the surface of the filter powder. Eventually, the accumulated dirt causes the filter pressure to rise flow to diminish. This is when ordinary filters need backwashing - But Not Perflex. Simply activate the Perflex "Bump" handle, and within a minute, flow and pressure are back to normal.

Features:
• 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 Duralon for dependable, corrosion-free performance.
• Integral check valve prevents system backflow whenever pump is off.