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Perflex Extended-Cycle DE Filter 20 Sq.Ft. (with Clamp)

Hayward

SKU: EC40AC

Perflex extended-cycle diatomaceous earth (DE) filters provide superior water clarity and extended filter cleaning cycles without requiring backwashing.

Features

Perflex Extended-Cycle DE filters provide crystal clear, sparkling water at an economical price. Proven over many years, Perflex has set the standard in swimming pool filtration by incorporating the patented Flex-Tube™ design in combination with DE, the most effective filter media available. The result is superior water clarity, extended filter cleaning cycles — and no backwashing required.

Features and Benefits

  • Easy access clamp assembly
  • Cleans pools fast — removes even the smallest particles the first time through
  • Uses DE (diatomaceous earth), the most effective filter media available
  • Patented Flex-Tube system efficiently reuses DE powder and dirt mixture to form fresh cleaning surfaces
  • Exclusive bump handle activates the Flex-Tubes, causing them to instantly purge themselves of dirt and powder
  • Uniquely designed to expel any air that may be present in the system through the filtered water returning to the pool
  • Combination diffuser and lower mixing chamber specifically designed to produce a uniformed coating of DE on the Flex-Tubes
  • EXPERT LINE products can only be purchased through your local pool professional or in-store.  Exclusions, other terms, and conditions may apply.
  • 3+ Year Parts and Labor Warranties*

*When sold by a Hayward Rewards® partner. Exclusions, other terms and conditions may apply.

Brand Hayward
Cartridge No
Channel Expert Line
Effective Filtration Area 20 ft.²
Filter Type DE
GTIN 610377722742
Warranty - Labor None
Master Carton Qty 1
Pallet Qty 12
Warranty - Parts 2-year
Pool Type Above Ground, In Ground
Pressure Gauge No
Product Dimensions 26.5 " x 16 " x 16 "
Product Height 26.5 in
Product Length 16 in
Product Weight 26 lb
Product Width 16 in
Public Design Flow Rate 40 GPM
Quantity 1
Series Filters Perflex
Shipping Dimensions 32.5 " x 16.2 " x 19.9 "
Shipping Weight 29 lb
Sub Brand N/A
Turnover - 10 Hours 24,000 GPM
Turnover - 8 Hours 19,200 GPM
Number of Filter Elements 1
Valve Included
D.E. Capacity 4 lbs.
Parts Details

Click on the part number in the diagram to display the details.

Line Drawings

Perflex Chart

Questions & Answers

13 answered question(s)

06/24/26

Q: Hi, can I put a 1.5HP pump on the EC40 or should the recommended pump be 1HP?

A:
We recommend a 1 hp pump for the EC40

By Hayward Support

06/24/26

Q: Is this good for a 17,000 gallon pool

A:
Hi, filtration needs vary with location, and bather load. Contact a local Hayward Authorized Dealer for further assistance in choosing the right filter for your location. You can find a list of them by clicking on the Dealer Locator tab on the home page...

By Hayward Support

06/24/26

Q: I have a de50. I cannot get the DE to stick to the fingers the fingers clog really quick. I have replaced 25%of the and the check valve. Don't know what else to do

A:
Hi, for help with this contact a local Hayward Authorized Service Center. You can find a list of them by clicking on the Dealer Locator tab on the home page of our website Hayward.com

By Hayward Support

06/24/26

Q: What size pool is the EC40C92S filter meant for? My pool has 10,000 gallons. Will this filter work for that size?

A:
Hi, this filter should work fine on a 10,000 gallon pool.

By Hayward Support

06/24/26

Q: What is the MINIMUM GPM pump that this filter will allow?

A:
Hi, there is no minimum flow requirement for a DE filter. As long as you are flowing sufficient water through the system to fully filter the pool in 6-8 hours you are in good shape.

By Hayward Support

06/24/26

Q: Need to replace connection parts between the ec40ac filter to pump motor

A:
Hi, we do not sell direct. You can find a list of local Hayward Authorized Dealers by clicking on the Dealer Locator tab on the home page of our website Hayward.com

By Hayward Support

06/24/26

Q: What is the recommended pump for Hayward EC40AC Perflex Extended-Cycle D.E. Pool Filter? 1 hp? is 1.5 hp too much?

A:
Hi, a 1.5 hp will work fine with the EC40 filter

By Hayward Support

06/24/26

Q: I purchased an EC40 DE filter. I took it apart to clean it in the middle was a tall tube with the check valve. How do I place this back in the tank??? Does it connect to something and which way do I place it in the tank. Does the open side with the valve face towards the incoming water or the drain side??? And how do I keep it standing up when I place the top back on with the fingers??? I’ve called a couple company’s but they know nothing about this filter. They were numbers your company gave me! Please I need some help. Single lady so I do everything myself.

A:
Hi, give our Tech Support Group a call for help with this issue 908-355-7995

By Hayward Support

06/24/26

Q: I have an EC30 filter that I need to replace . Will the EC40 be a direct replacement and fit the same size base and pump ?

A:
Hi, someone from our Technical Service Department will contact you via email.

By Hayward Support

06/24/26

Q: I bought the EC40AC and it came with clamps to attach the hoses to the filter, etc. Can I buy extra clamps?

A:
You can. ECX18028 is the part number. We do not sell direct, but you can find a list of local Hayward Authorized Dealers by clicking on the Dealer Locator tab on the home page of our website Hayward.com

By Hayward Support

06/24/26

Q: I purchased an EC40AC filter. Is that supposed to come with a base?

A:
Hi, the filter does not come with a base.

By Hayward Support

06/24/26

Q: I am trying to re-open the pool and it is with light green water. I have added the opening kit liquids, but when I try to circulate water, after 6 -7 mts filter pressure goes upto 20psi and start leaking from filter top. Even after back washing it is the same. I am unable to clean the pool. What should I do ?

A:
For help with this contact a local Hayward Authorized Service Center. You can find a list of them by clicking on the Dealer Locator tab on the home page of our website Hayward.com

By Hayward Support

06/24/26

Q: What is the price

A:
Hi, we do not sell direct and therefore do not quote pricing. You can find a list of local Hayward Authorized Dealers by clicking on the Dealer Locator tab on the home page of our website Hayward.com

By Hayward Support