By Hayward Pool Products



Part # W3EC40AC

Warranty 1 Year

Alternate Part #'s 3280-42, 3280-42P, 3283-300, 61155, 807318017887, EC240, LET-201-2155, LLEC40, HPPW3EC40AC

Product Description

Hayward is updating these filters (a slight design change to the lid and color changes to the exterior parts).  The one you receive may appear different from the one in the image.

Perflex Extended-Cycle D.E. filters clean pools fast, removing particles as small as one micron the first time through. Its patented Flex-Tube™ design gives longer cycles between cleaning because the same D.E. filter powder is used over and over. Plus, Perflex cleans without backwashing, saving hundreds of gallons of treated pool water. An exceptional value as a replacement filter or for new pool installations. For sparkling, clean pools, step up to Perflex.


  • In-ground pools of all types and sizes


  • 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  

Hayward D.E. Filter Systems

Click here for more Hayward Filters  

Product Specifications

Port Size:
1 1/2 in.
Flow Rating:
40 GPM
Filtration Area:
20 sq. ft.
Turnover 8 Hrs.:
19200 gal.
Turnover 10 Hrs.:
24000 gal.
Pool Type:
In Ground
Filter Type:

?     Asked on 8/4/2007by Guest

The manual says that a diverter valve can be installed for vacuuming to waste during heavy spring clean up or pulling rain water out of the pool. Where would it be installed? Do you sell this valve?

A  Answered on 8/4/2007 by InyoPools Product Specialist Patrick P.

Yes we do carry this diverter valve which you may view or purchase through this link http://www.inyopools.com/Products/07501352023400.htm This valve has 3 ports on it, the valve would screw into the disharge side of your pump and you can have the handle turned so the return water goes through your filter or you can turn the valve in the opposite direction so the dirty water goes to waste and bypasses your filter, this is very helpful when vacuuming or for heavy spring clean up.

?     Asked on 6/20/2008by Guest

How much D.E. does the EC40AC require?

A  Answered on 6/20/2008 by InyoPools Product Specialist Patrick P.

The EC40AC requires 4 lbs.

?     Asked on 3/12/2015by joe

Is the EC40AC filter ok for a 24 foot round pool 15000 gallon?

A  Answered on 3/13/2015 by InyoPools Product Specialist Robert M.

Hello Joe - The EC40AC can handle a 24' 15,000 gallon pool. The EC40AC can handle pumps up to 1HP.

?     Asked on 4/23/2015by Warren

Why buy a more expensive Hayward de pool Filter if this one says in ground all types all sizes EC40a or ex 50a

A  Answered on 4/23/2015 by InyoPools Product Specialist Lennox H.

Warren, You would have to match the filter size with your pump GPM. That's how you determine what size filter to get, the bigger the filter the better.

?     Asked on 4/23/2015by Warren

Ec40a or ec75a why buy the 75a when the 40 a days all in ground pools all sizes?

A  Answered on 4/23/2015 by InyoPools Product Specialist Lennox H.

Warren, 20sq ft of filtration verses 40sq ft of filtration, EC75A offers more filtration than the EC40A.


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