Hayward Pro Grid DE Filter 36 Sq Ft w/o Valve - W3DE3620



Part # W3DE3620

By Hayward Pool Products

  5 Average  



Part # W3DE3620

Warranty 1 Year Warranty

Product Description

Hayward Pro-Grid vertical grid D.E. filters provide superior water clarity, efficient flow and large cleaning capacity for pools and spas of all types and sizes. Constructed with high-strength reinforced thermoplastic, Pro-Grid combines high-technology features and "service-ease" design for an unparalleled filtration value for both new pool and aftermarket installations.

In addition, the Hayward Pro-Grid filter delivers low maintenance and dependable operation.


  • Reinforced thermoplastic filter tanks constructed from durable glass reinforced copolymer to meet the demands of the toughest applications and environmental conditions, including in-floor cleaning systems
  • Self-Aligned tank top and bottom make access to servicing the grid elements fast and simple
  • Heavy-duty, tamper-proof one-piece flange clamp securely fastens tank top and bottom, allowing for quick access to all internal components without disturbing piping or connections
  • High impact grid elements designed for up-flow filtration and top-down backwashing for maximum efficiency
  • Integral lift handles and uniform low-profile base make removal of grid nest fast and simple
  • Inlet diffuser elbow distributes flow of unfiltered water evenly to all filter elements and provides even distribution of D.E. to grids
  • 72 ft filter made of reinforced thermoplastic allows for both commercial and large residential applications and years of non-corrosive, trouble-free performance
  • New High capacity, rapid release manual air relief valve bleeds air with a quick quarter turn of the lever

Click here for more Hayward Filters

Product Specifications

Multiport Valve:
DE Required:
4.5 lbs.
Flow Rating:
72 GPM
Filtration Area:
36 sq. ft.
Turnover 8 Hrs.:
34560 gal.
Turnover 10 Hrs.:
43200 gal.

?     Asked on 7/21/2019 by Norma Pullen

I currently have a DE3600, w/Hayward CL200 chlorinator that is cracked. Would like to replace with cartridge filter. System also has heat pump. What would your recommendation be for cartridge filter? Also there is water seepage coming from piping that goes into top of pump.


A  Answered on 7/21/2019 by InyoPools Product Specialist Lennox H.

Hi, Norma. I recommend the Hayward SwimClear C3030 or C4030 as a replacement. 

?     Asked on 7/15/2019 by Phil Frassinelli

I have a de 3600 24 years old. Replaced the filter elements and baffle. I also replaced the pump. Pressure is around 11. Used to be 18-19. On recirc the pressure on the is 11 but returns and skimmers look like normal. Any suggestions

A  Answered on 7/15/2019 by InyoPools Product Specialist Hector F.

If you are getting good flow pressure back to the swimming pool with no D.E. powder leaking back into the pool then a lower filter gauge pressure reading is actually a good thing for it means less water resistance from within the filter body itself. 

?     Asked on 6/30/2019 by Phil

I have a Haywood model # DE3620 that was installed in 2005, and need new DE Grids, what do I need?

A  Answered on 7/1/2019 by InyoPools Product Specialist Matt S.

Hello - the complete grid set for your Hayward DE3620 is the FG1003PACK - 36 Sq. Ft. Grid Pack 18" (7 Full & 1 Partial)

?     Asked on 6/5/2019 by Fred

I have and older Haywood DE 3600 that may need new grids. how much will they cost?

A  Answered on 6/5/2019 by InyoPools Product Specialist Patrick P.

Hi Fred, You have two options when replacing your DE Grids. Option 1 would be to get a complete Pre Assembled Drop In Grid Assembly $329 or you can purchase the loose DE Grids click here for the 8 DE Grids for the Hayward DE3600 Filter $105. We put together a Video on How to Replace Your DE Grids which you find helpful when you tackle this project.

?     Asked on 2/7/2019 by Sid

I am replacing 18 year old Hayward C4000 cartridge filter with a new Hayward DE 3620 filter. My current plumbing set up does not have a separate variable flow valve, only Jandy valves. Can I connect the new DE filter directly to my current plumbing setup, w/o the variable flow valve?


A  Answered on 2/8/2019 by InyoPools Product Specialist Lennox H.

Hi, Sid. Unfortunately, you cannot. This DE filter requires a valve. 

  • Commented on 2/8/2019 by Product Owner

    Can you recommend a valve model?

    • Commented on 2/8/2019 by InyoPools Product Specialist Lennox H.

      Hi, Sid. You options are Model # SP0710XR50 (1-1/2" Pipes) or SP0715XR50 (2" Pipes).

?     Asked on 6/12/2018 by Bonnie Brown

I have a 24 year old Hayward DE2400 that I can't say enough about! ?? Can I replace it with the 3620 with all of my existing fittings? Also....how long would delivery to Massachusetts take?

A  Answered on 6/12/2018 by InyoPools Product Specialist Hector F.

Yes, you can change to another newer Pro Grid filter model for an easy swap. 

?     Asked on 6/10/2018 by teejan Wojohk

I have De3620 can i switch it with DE6020 issue with pressure is low and not filtering, clean it 2 time gage pressure will not go below 20

A  Answered on 6/11/2018 by InyoPools Product Specialist Hector F.

You can switch but it may not be an issue that a larger filter will resolve. I would start by putting the valve in the recirculation position and if the return pressure increases then the issue is the grids need to be cleaned well or even replaced. 

?     Asked on 6/4/2018 by edward sullivan

I have a Hayward DE 3600 Micro clear filter from the 90's which filter head [ or cover] finally cracked. The cover is part Z-1. The outside diameter is 21 1/4 inches. the inside dia. is 201/2 inches. Is there any way I can get this part as the interior has new grids and a motor which is only a year old. thank you

A  Answered on 6/4/2018 by InyoPools Product Specialist Hector F.

Unfortunately, the lid for your model filter is obsolete. The best places to try and locate that would be at maybe a local pool retailer. 

?     Asked on 8/5/2017 by Ken

What's the problem when the DE powder get s back into the pool. Cleaned filter an still how the problem.

A  Answered on 8/5/2017 by InyoPools Product Specialist Alex V.

Ken, If d.e. powder is shooting back into the pool, it can be bad grids, a cracked manifold or a pinched o-ring. 

?     Asked on 8/3/2017 by Jerry Mazzone

Hi what is the normal pressure of DE 3620 filter supposed to run at? Thanks

A  Answered on 8/3/2017 by InyoPools Product Specialist Lennox H.

Hi, Jerry. The filter pressure will vary due to several factors such as the type of pump used, flow rate, pipe size etc. The lover the filter pressure the better. 

?     Asked on 5/18/2017 by Ray

I currently have a Hayward pro grid DE3620 filter. I am looking to purchase a new energy efficient pump. I have an in ground 20,000 gal pool. the old pump is a hayward single speed 1 1/2 hp gold series I believe. What would be my best option for a new pump. The piping is 1 1/2".

A  Answered on 5/18/2017 by InyoPools Product Specialist Patrick P.

Hi Ray I would suggest the PL2605 1.65 HP PureLine Prime Variable Speed Pump as a great energy efficient pump that could be used with this filter.

?     Asked on 2/17/2017 by Dave

My Hayward D E 3600 (25 years old) has a crack in the dome squirting water. Can I replace it with t h e Hayward 3620 and will the fittings fit my piping or should I try a different model?

A  Answered on 2/17/2017 by InyoPools Product Specialist Scott W.

Yes, the fittings will be the same.

?     Asked on 10/11/2016 by Jeff

I have a 10x20 igp with 17 year old Hayward DE4800 filter and 1.5hp super pump. I go the whole season without having the clean or backwash the filter. I'm looking to replace the filter and was considering the DE3620, is this the right one to get, and is the 1.5hp pump too much power for this filter or can I use it? I was considering rebuilding the the motor or is a new one a better choice?

A  Answered on 10/12/2016 by InyoPools Product Specialist Megan C.

Hi, Jeff. I best recommend replacing it with the same/new Hayward Pro Grid DE Filter 48 Sq Ft w/o Valve - DE4820. The Hayward Super Pump 1 1/2 HP Single Speed - SP2610X15ump has maximum output of 83 gallons per minute. Depending on the location of the equipment to the Total Resistance to Flow, you may exceed the design flow rate of the Hayward Pro Grid DE Filter 36 Sq Ft w/o Valve - DE3620 at 72GPM. Please review our How to Size a Pool Pump for Your In-Ground Pool first. 

?     Asked on 8/5/2016 by Russ Mattison

I have a 15 X 30 X 5 ft. inground pool with attached spa. I am running an old Waterway Crystal Water DE filter with a Pentair WFE-8 pump (2 in piping and a multiport valve). I replaced all the broken filter grids this spring and now I am again spewing DE into the pool. I think I need to replace the filter as it may be too small for the pump. I cannot read any of the markings on the filter (they all faded) What size filter should I have with this pump?

A  Answered on 8/16/2016 by InyoPools Product Specialist Lennox H.

Hi Russ, The filter that you currently have is too small to be used with the WFE-8 pump. You will then need to determine the flow rate by calculating the "Feet of Head" of your pool in order to properly size a filter. That will be the determining factor on what size filter you need.

?     Asked on 7/10/2016 by

what size de filter do i need fora 19000gal pool with a 3/4hpee motor

A  Answered on 7/11/2016 by InyoPools Product Specialist Matt S.

For a pump and pool that size, The Hayward Pro-Grid DE3620 will work fine, but you can use any of the filter sizes above that like the DE4820, DE6020, or DE7220. The larger the filter, the longer you can go between cleanings and maintenance. If you want a thorough guide on how to size a pool filter read/watch this guide: Inground Pool Equipment Selection Part 2: Filters

?     Asked on 7/6/2016 by

can I backwash a de4820 filter? if so how cant find outlet

A  Answered on 7/10/2016 by InyoPools Product Specialist Lennox H.

Hi, You can backwash a DE4820 filter using a slide or multiport valve. The "waste" port is located on the valve.

?     Asked on 6/19/2016 by Paul

What would the replacement filter be for an old Hayward De2400 thanks.

A  Answered on 6/19/2016 by InyoPools Product Specialist Matt S.

The replacement filter for the Hayward Micro-Clear DE2400 is the Hayward Pro-Grid DE2420.

?     Asked on 5/11/2016 by John

Is their an advanage by going to a higher volume filter? i.e. my filter should be a DE3620. If I go to a DE4820 will there be any type of advanage?

A  Answered on 5/11/2016 by InyoPools Product Specialist Hector F.

Yes, the advantage would be that the larger filter likely would not need to be cleaned as often and could handle extra water pressure if the motor is ever up sized.

?     Asked on 5/5/2016 by Brandon

Hayward Pro Grid DE Filter 36 Sq Ft w/o Valve - which valve can I purchase to use with this filter. Multiport valve or glide valve?

A  Answered on 5/6/2016 by InyoPools Product Specialist Andy O.

Brandon- With the DE3620 Hayward Pro Grid DE Filter 36 Sq Ft w/o Valve you have a couple options as far as valves, if you want the multiport valve you can use the Vari-Flo Valve 1 1/2" for DE or Vari-Flo Valve 2" for DE and if you want to use a slide valve you can use Valve Ass'y, Slide -2" Skt Wg (sp0410x502s).

?     Asked on 6/17/2015 by doug

I have this model filter for a 20,000gal in ground pool. What is the minimum size pool pump hp I should use when relacing the pump?

A  Answered on 6/17/2015 by InyoPools Product Specialist Brian M.

This filter is designed to handle a flow rate of  72 gallons per minute. Not all 1hp pumps have the same flow rate. It varies depending on design. The minimum would be a 3/4hp, but no more than a 1hp.

?     Asked on 9/15/2014 by Guest

How much D.E. does this Hayward de3620 filter use?

A  Answered on 9/15/2014 by InyoPools Product Specialist Patrick P.

This model filter uses approximately 6 lbs. of D.E. when completely empty and approximately 3lbs. of D.E. after backwashing.

?     Asked on 10/8/2013 by Guest

How do I backwash my Hayward Vertical Grid DE filter?

A  Answered on 10/8/2013 by InyoPools Product Specialist Patrick P.

When the filter pressure rises 8-10 PSI over the clean starting pressure, the filter must be backwashed. Turn off the pool pump. Rotate the multiport valve to backwash position or slide the slide valve up. When the pump is turned on, the dirty DE and water will flow out to waste. Once the water runs clear, turn off the pump. With a slide valve, push the handle down and start the pump. Once the pump is primed, add the required DE. If using a multiport valve, rotate the handle to rinse. Turn on the pump and let water flow for 20-30 seconds, cleaning out the plumbing lines. Turn off the pump and rotate the valve back to filter. Turn on the pump and once primed add required DE.

?     Asked on 5/2/2013 by Guest

Do you carry replacement grids for the Hayward DE3620 filter? If so, are they made by Hayward?

A  Answered on 5/2/2013 by InyoPools Product Specialist Patrick P.

Hayward doesn't make the grids for their filters. The grids are usually made by a different manufacturer. We do carry replacement grids here: http://www.inyopools.com/cartridges_unicel.aspx


Est. Repair Time

Less than 1 hr

Tools Needed

Pliers, Socket Set

my old filter had a crack in it

Written on 6/14/2017 by Guest

so I ordered a new one and it came in a timely manner, and you send me a step by step how to and it went smooth as silk

Were these instructions helpful? 


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