Perflex DE Filter 20 Sq. Ft. - EC40AC



Part # EC40AC

By Hayward Pool Products

  5 Average  



Part # EC40AC

Warranty 1 Year

Product Description

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.

?     Asked on 7/3/2017 by Judy

We have a Perflex DE Filter 20 Sq. Ft. - EC40AC is this the right filter for an 18,000 gallon pool? Also, what is the average life of one of these filters?

A     Answered on 7/3/2017 by InyoPools Product Specialist Lennox H.

Hi, Judy. This EC40AC Filter is sufficed for an 18,000 gallon pool. The average life of the filter media is about 3-4 seasons or 2 years depending on how dirty the pool is.  

?     Asked on 6/21/2017 by richard schoonmaker

how many flex tubes on a hayward model ec40ac filter, how long are thay and how much a piece are they?

A     Answered on 6/21/2017 by InyoPools Product Specialist Patrick P.

The EC40AC uses 72 Flex Tubes and the Flex Tubes are $5.99 each

?     Asked on 6/17/2017 by phil

is the ec 40 ac filter body the same configuration as the extended cycle ec 50. I have a bad set of fingers on my ec 50 and want to replace it with the 40 ac filter and body

A     Answered on 6/25/2017 by InyoPools Product Specialist Lennox H.

Hi, Phil. The EC40AC body is smaller than the EC50 unit but the swap should not be difficult. 

?     Asked on 6/9/2017 by Charlotte Chant

What size pump do you need for a 10,000 gal pool? My pump handle is broken on present one, Should I replace ? It is 20 yrs. old. The new model seems a lot easier. Probably worth the investment, please advise.

A     Answered on 6/9/2017 by InyoPools Product Specialist Patrick P.

Hi Charlotte when you say pump I assume you mean filter. For a 10,000 gallon pool I would suggest the EC65A PerFlex Filter

?     Asked on 5/13/2017 by John

Our above ground pool is a 15 x 30 oval and 52" deep. Will the EC-40 D.E. filter system be big enough?

A     Answered on 5/14/2017 by InyoPools Product Specialist Lennox H.

Hi, John. The Perflex EC40 is large enough for a 15'x30' pool as along as your pump does not exceed 40 GPM.

?     Asked on 4/2/2017 by

my existing filter is a ec40 not ec40ac is there a difference

A     Answered on 4/4/2017 by InyoPools Product Specialist Lennox H.

Hi, The AC model uses a clamp assembly instead of nuts and bolts to seal the unit.

?     Asked on 9/16/2016 by ranae

How do i change the fingers

A     Answered on 9/16/2016 by InyoPools Product Specialist Stacey M.

Hello Ranae, we don't have very many videos for this, but I did find a few on another site to better walk through your filter.

?     Asked on 9/9/2016 by diane dibble

how r do you get the filter cover off after you loosen the bolt

A     Answered on 9/9/2016 by InyoPools Product Specialist Stacey M.

Hello Diane, there is a how to video on filter grids/cleaning.

?     Asked on 8/6/2016 by Tom

How many fingers does the EC-40AC have?

A     Answered on 8/11/2016 by InyoPools Product Specialist Alan M.

It appears the EC-40ac has 72 flex tubes.

?     Asked on 7/28/2016 by Randy

need a pump handle for an ec40 . can I order one ?

A     Answered on 7/28/2016 by InyoPools Product Specialist Alan M.

Hello, Here is a link to the Hayward Perflex D.E. FIlters EC-30, EC-40 & EC-40AC Parts page. The handle for the EC-40 is part number 4810-80C.

?     Asked on 7/12/2016 by Guy

I have a EC40AC and DE seems to be seeping into the pool, I had a bad check valve, replaced it and it fixed the issue of cloudy water in my "basket" but it didn't solve the problem of DE seeping into the pool, I inspected the "fingers" as best I can and they seem fine, any suggestions?

A     Answered on 7/17/2016 by InyoPools Product Specialist Lennox H.

Hi Guy, A small tear in the fingers that is invisible to the eye can cause DE to get back into the pool. If you're sure it's not tubes them it could be the diaphragm.

?     Asked on 6/22/2016 by

whats the difference between an ec40 andanec40acfilter

A     Answered on 6/22/2016 by InyoPools Product Specialist Lennox H.

Hi, The EC40 unit has the bolt-on lid and the EC40AC has the clamp-on style lid.

?     Asked on 6/10/2016 by RICHARD HERBISON

What are the external dimensions of this filter, can I use it for a spa?

A     Answered on 6/22/2016 by InyoPools Product Specialist Lennox H.

Hi Richard, The dimensions of this unit is 26-1/2"H x 16"W.

?     Asked on 6/9/2016 by Joe

I was thinkibg about purchasing the ls40 grid for my filter, but can across the perflex de 20, my pump is a Hayward 1.0 hp, any recommendations never used a unit with those fingers in the filter

A     Answered on 6/9/2016 by InyoPools Product Specialist Patrick P.

Hi Joe, I'm not a big fan of the finger as they can be quite expensive when they need to be replaced, almost as much a complete filter.

?     Asked on 6/4/2016 by Anna

We have a 24 feet above ground pool with a Hayward De Filter, model ec45. We've been using it for 12 years with no problems. However, this year, the DE is flowing back into the pool. Do you know what can be causing this? The pool water has been tested and it is fine. The water is clear except for the DE which is making it cloudy when stirred up. This will be our last season for the pool as we will be getting rid of it. I don't want to replace the filter since it is our last year. Thanks.

A     Answered on 6/4/2016 by InyoPools Product Specialist Patrick P.

Hi Anna, This is most likely damaged DE fingers. You can replace the damaged DE Fingers by using the Perflex EC Replacement DE Fingers.

?     Asked on 5/30/2016 by Dan Kusner

I would like to install a Hayward 1 Hp PowerFlow 2 speed matrix Pump (SP15922S) along with a Hayward EC50AC filter. In addition, I would like to use a Hayward Heat Pro Heat Pump (95,000 BTU.) Is this an efficient configuration? What are your recommendations for the base for the pump and filter? Are there base units that accommodate this pump and filter? Where would I find them?

A     Answered on 6/2/2016 by InyoPools Product Specialist Lennox H.

Hi Dan, You can purchase the EC40C92S which includes the base that the pump and filter sits on. An this system will be a good match with the Hayward Heat Pro Heat Pump (95,000 BTU) - HP21004T.

?     Asked on 5/30/2016 by GEOFFREY AZZARI


A     Answered on 6/3/2016 by InyoPools Product Specialist Lennox H.

Hi Geoffey, I would recommend leveling the filter. Also where is the filter leaking from, you may need to replace a gasket or o-ring.

?     Asked on 6/16/2015 by Thomas Meek

I keep seeing backwash the filter if the pressure is going, I have the bump de filter, is there a backwash on this filter ? I do not see anything on my filter that says backwash, am I missing something?

A     Answered on 6/18/2015 by InyoPools Product Specialist Lennox H.

Thomas, On the DE and Sand Filter's the term backwash refers to the process of cleaning out the filter. You can find the instructions to clean the filter in the Perflex DE Filter Owners Manual under cleaning.

?     Asked on 6/15/2015 by

Will the ec40 be large enough for a 32'x18'x 54 in. pool?

A     Answered on 6/15/2015 by InyoPools Product Specialist Patrick P.

If possible I would suggest going up to the Hayward EC50AC Filter.

?     Asked on 6/13/2015 by Thomas Meek

Where can I get TSP, do pool suppliers carry it?

A     Answered on 6/14/2015 by InyoPools Product Specialist Patrick P.

The easiest bet would be to purchase it online. You can Purchase TSP Powder Online here.

?     Asked on 6/13/2015 by Jasper Berti

After the filter runs for 4 to 5 hours it leaks heavily from where the top seals. if you turn it off and back on it takes several hours to leak again. filter is 3 years old

A     Answered on 6/14/2015 by InyoPools Product Specialist Patrick P.

We would suggest replacing the EC40AC Body Gasket (Key #12) and / or the Bump Shaft Kit (Key #13). Both items can be seen on the EC40AC Perflex Filter Parts Diagram.

?     Asked on 6/12/2015 by Thomas Meek

I have had this Hayward bump filter for 15 years, it's the one that has all the fingers down inside, I had a very low ph, I started adding ph+ and right away my filter started plugging up, I cleaned it in acid and water for 3 hrs, started back up, flow was good for about 45 mins. Do you have a suggestion?

A     Answered on 6/13/2015 by InyoPools Product Specialist Alex V.

Thomas, Did you clean the fingers with a product like TSP before acid washing? If not, dirt and oil can be sealed inside of the cloth covering the fingers. Another possible cause for what you've described is particles in the water (cloudy water).

?     Asked on 6/12/2015 by June

Hi Patrick,Thank You for getting back with me so quickly. Although you said in our previous conversation that our gasket may need to be replaced due to the leaking around the seal when we connect the top of our filter to the bottom....we have a D.E.filter model# EC40C92S and there isn't a gasket between the top & bottom,the two pieces just butt together. Do you have another idea for this model ?? Again Thank~You in advance. (serial # 21120811002628006)

A     Answered on 6/12/2015 by InyoPools Product Specialist Patrick P.

Hi June, You should have this EC40 Body Gasket between the top and bottom of your filter. This gasket is depicted as key #12 on the EC40 Perflex Parts Diagram. If you do not have this gasket installed then this would be your problem. If your do have this gasket then I would inspect the gasket to see if there are any imperfections in it.

?     Asked on 6/11/2015 by June

Hi Can you tell me what would cause the filter to leak on both sides? where the top & bottom are joined with that black collar...we've tightened them & the leak gets even worse....I even put pool lube all around the top nothing seems to help...we have taken it apart several times it seems to be fine with no leaks until we turn the pump on & then there's a steady stream of water running down both sides....Thank You in advance

A     Answered on 6/11/2015 by InyoPools Product Specialist Patrick P.

I would check the gasket which goes between the top half and bottom half of the filter, if you see any imperfections in the gasket then it may be time to replace the gasket.

?     Asked on 6/9/2015 by Robert

Hi my pool size is 15x26 WXL with a 1 HP pump which model filter should I get. My pool is rectangular

A     Answered on 6/9/2015 by InyoPools Product Specialist Patrick P.

Hi Robert, If your pool is an above ground pool then this EC40AC filter would pair nicely with your 1 HP pump. If you have an inground pool then I would suggest going with the larger EC65 Perflex Filter.

?     Asked on 6/9/2015 by Ray

I have model EC-50. Its pretty old and when I back washed I noticed what looks like pieces of the fingers coming out of the port. Can I just replace the fingers or is it time for a new filter? If i can replace the fingers what is the part number and where can i buy it?

A     Answered on 6/9/2015 by InyoPools Product Specialist Patrick P.

Hi Ray, You would need the EC50 DE Fingers, considering the fact that the complete EC50AC Perflex DE filter is less expensive then replacing the EC50 DE Fingers then I would go with the complete new EC50AC filter.

?     Asked on 5/26/2015 by

I have a Hayward DE filter model EC45 2 yrs. ago changed motor last year the filter housing cover just put it altogether started it filtering and noticed water coming threw bump handle shaft is there gaskets for that also if i change that should i change the housing gasket

A     Answered on 5/26/2015 by InyoPools Product Specialist Patrick P.

I would suggest the Hayward Perflex Bump Handle Gasket Kit if you are just getting leaking out of the handle then this kit should be all you need.

?     Asked on 5/25/2015 by Brian

I just opened my pool. I have a hayward DE earth filter. The pool is pretty clean but the filter runs only a few minutes and loses pressure, I bump it and only a few minutes it loses pressure. Do the fingers need to be cleaned or replaced? It is an old filter with a new motor, and I clean it out every year. What should I do? Thanks

A     Answered on 5/25/2015 by InyoPools Product Specialist Robert M.

Hello Brian - If the pool water is clear and the pressure rises on the pressure gauge quickly, the fingers will need to be cleaned or replaced. If the water is cloudy and the pressure on the gauge rises quickly, this is normal. You may have to backwash several times a day until the water is clear. If the pressure on the gauge is dropping, you may have an air leak. Check out our guide on how to correct air leaks.

?     Asked on 5/13/2015 by PETE

Is the 20ft good enough for a 24ft rd 4ft pool or am i pushing it. Would I be running the pump constantly. i'm guessing there are 9 to 10 thousands gallons in pool.

A     Answered on 5/13/2015 by InyoPools Product Specialist Patrick P.

Hi Pete, I would suggest going up to the 25 Sq. Ft. EC50AC Hayward Perflex Filter for a 24' round pool. This will put less strain on your pump and means longer time between cleaning your filter.

?     Asked on 4/23/2015 by 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.

?     Asked on 4/23/2015 by 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 3/12/2015 by 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 6/20/2008 by 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 8/4/2007 by 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 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.


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