36 Sq. Ft. Grid Pack 18" (7 Full & 1 Partial) - FG1003PACK



Part # FG1003PACK

  4.95 Average  



Part # FG1003PACK

Alternate Part #'s FC-9530, FS2003, PFS1836

Product Description

Generic replacement DE filter grids offer an economical way to maintain your pool filter's optimal performance. Seeing DE powder in your pool is a typical sign of one or more torn grids which need to be replaced.


  • Woven polypropylene grid fabric allows consistent water flow
  • Sturdy frame supports grid fabric
  • Fits many of the most common 36 sq ft DE filters
  • Quality comparable to OEM grids

*Most DE filters require 7 full Grids and 1 partial grid. This is a pack which includes 7 full grids & 1 partial grid.

Filter Area (Sq. Ft.). Grid Length Indentification Full Grid Part # Partial Grid Part # Full Grid Width Partial Grid Width
24 12" American, Hayward, Pac-Fab, Pentair, Sta-Rite FG1002 PG1902 11 - 1/2" 9 - 1/2"
36 18" American, Hayward, Pac-Fab, Pentair, Sta-Rite FG1003 PG1903 11 - 1/2" 9 - 1/2"
48 24" American, Hayward, Pac-Fab, Pentair, Sta-Rite FG1004 PG1904 11 - 1/2" 9 - 1/2"
60 30" American, Hayward, Pac-Fab, Pentair, Sta-Rite FG1005 PG1905 11 - 1/2" 9 - 1/2"
72 36" American, Hayward, Pac-Fab, Pentair, Sta-Rite FG1006 PG1906 11 - 1/2" 9 - 1/2"

Note: Collar has open slot (2 notches). Length is measured from one end of the grid to the other (collar not included).



Product Specifications

36 sq. ft.

?     Asked on 6/3/2018 by

Will this fit Pentair 4000 series

A     Answered on 6/3/2018 by InyoPools Product Specialist Hector F.

No, actually the grids for the Pentair/Purex 4000 series are listed at key 8 when you click here

?     Asked on 5/7/2018 by Fred

I have a PAC-FAB FNS 36 will FG1003 grid pack fit?

A     Answered on 5/7/2018 by InyoPools Product Specialist Lennox H.

Hi, Fred. Yes, this 36 Sq. Ft. Grid Pack - FG1003PACK is correct for the PAC-FAB FNS 36 filter. 

?     Asked on 3/26/2018 by

Are these the right replacement grids for my pentair fns plus filter?

A     Answered on 3/26/2018 by InyoPools Product Specialist Kevin G.

Hello, if you have the FNS Plus 36 Sq Ft then this assembly will work for your system.  

?     Asked on 8/23/2017 by Nick

is this the correct fil-grids for a HAYWARD MODEL DE6020

A     Answered on 8/23/2017 by InyoPools Product Specialist Lennox H.

Hi, Nick. The 60 Sq. Ft. Grid Pack - FG1005PACK is the correct size for the DE6020 model filter.

?     Asked on 6/25/2017 by sef

I have a Hayward de3620 filter I need new grids for it which ones do I need grids only

A     Answered on 6/25/2017 by InyoPools Product Specialist Hector F.

Yes, this is the correct grid pack for your filter.

?     Asked on 6/22/2017 by andrew

I have a hayward de filter model 4820 what replacement full filter grid part do i need

A     Answered on 6/23/2017 by InyoPools Product Specialist Lennox H.

Hi, Andrew. You can use either p/n FG1004PACK  or DEX4800DC for the DE4820 unit. 

?     Asked on 6/18/2017 by Holly

Will these fit our Hayward DE-3600 micro clear filter?

A     Answered on 6/20/2017 by InyoPools Product Specialist Lennox H.

Hi, Holly. Yes, this grid pack will fit the DE-3600 model filter.

?     Asked on 3/29/2017 by AD

The description is "generic" filter grids. Are these Unicel brand?

A     Answered on 3/29/2017 by InyoPools Product Specialist Scott W.

Yes, the manufacturer is Unicel.

?     Asked on 2/24/2017 by olisser villarreal

I have to replace all DE filters on my Nautilus Model NS 36 Serial 048610 ,filter area 36 sq ft . Not sure which filter I should be getting for my system .

A     Answered on 2/24/2017 by InyoPools Product Specialist Scott W.

A good replacement for your current filter is part number 180007.

?     Asked on 7/19/2016 by Ron

I am getting DE on the steps of the pool. My pool was built in 1983 or 1984. It has a stainless steel filter tank--model NS-36. I need to replace the 8 grid screens, as well as the plastic housing (due to some damage). What is the right replacement parts for my pool ? Thank you. Ron

A     Answered on 7/19/2016 by InyoPools Product Specialist Scott W.

The grid assembly which includes the grids and the manifold is part number 192325.

?     Asked on 6/23/2016 by Simon Williams

If this is the correct item then I would like to order tomorrow. Can you confirm: (1) that these are the filter elements for the following pool filter: Titan RPM Vertical Grid D.E Filter (marketed by Pentair) Model No. 188585 (H-18-8550) RPM36 Series No. RPMF3731 Height 160cm Diameter 92cm Filter Surface P2 = 36 Filter Surface m2 = 3,34 Max Pressure 350kPa 20m3/h (2) the dimensions of the package and weight? (3) the postage to Ohio? (4) postage times to Ohio

A     Answered on 6/30/2016 by InyoPools Product Specialist Lennox H.

Hi Simon, The 36 Sq. Ft. Grid Pack (FG1003PACK) will fit the Titan RPM Vertical Grid D.E Filter 188585. Shipping dimensions are approximately 22"H x 17"W. Free ground shipping which can take 3-5 business days.

?     Asked on 6/19/2016 by mike

i have a hayward de filter looking for complete grids

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

What is the model number of your Hayward pool filter?

?     Asked on 6/12/2016 by Steve R

I have a Pentair FLT FNS PLS 36 filter and want to buy a replacement grid set. Which one should I get?

A     Answered on 6/12/2016 by InyoPools Product Specialist Patrick P.

Hi Steve, Yes this correct DE grid set for the Pentair FLT FNS PLS 36 filter.

?     Asked on 6/4/2016 by Mike

I have an old PAC-FAB Nautilus NS 36 de filter. I would like to replace all the grids. Is this the correct pack to order? Thanks

A     Answered on 6/5/2016 by InyoPools Product Specialist Patrick P.

Hi Mike, Yes this DE Grid Pack is the correct kit for the PAC-FAB Nautilus NS 36 de filter.

?     Asked on 5/25/2016 by larry dias

what is the quality of the grids

A     Answered on 5/26/2016 by InyoPools Product Specialist Lennox H.

Hi Larry, The quality of these grids are good, it's manufactured by Filbur.

?     Asked on 5/8/2016 by jon

Hello, I have an American Products RPM filter (36 sq feet) model n°188585 Is the FG1003PACK what I need to replace my elements? Thanks jon

A     Answered on 5/10/2016 by InyoPools Product Specialist Lennox H.

Hi Jon, The FG1003PACK will fit the American Products RPM filter.

?     Asked on 5/7/2016 by

I have a Hayward DE3620 model and need to replace the filter grids. Which replacement set should I purchase? Thanks.

A     Answered on 5/7/2016 by InyoPools Product Specialist Andy O.

Hello- The FG1003Pack 36 Sq. Ft. Grid Pack (7 Full & 1 Partial) is the correct grid pack for the Hayward DE3620.

?     Asked on 5/5/2016 by Don

I have a Purex Triton Nautilus FNS 36 but it is not the Plus version. There are 7 grids 18 x 11.5 and 1 grid 18 x 9.5. Is part # FG1003 the correct grids? Tanks

A     Answered on 5/5/2016 by InyoPools Product Specialist Charlie R.

Don,Yes, the FG1003PACK is the correct grid pack for your Nautilus FNS 36 filter.

?     Asked on 3/9/2016 by

I have a Hayward DE 3600 Model. Will your 36 SQ FT Fit?

A     Answered on 3/10/2016 by InyoPools Product Specialist Robert M.

The FG1003PACK will fit the Hayward DE3600 model.

?     Asked on 12/10/2015 by Lori

I have a Hayward put in 2003 and need a new filter element cluster. How do I determine which size I need?

A     Answered on 12/10/2015 by InyoPools Product Specialist Brian M.

If you are lucky, the sticker on the front of the tank will have a mark next to your model number. Barring that, if you measure the length of one of the grids ( top to bottom ) and then multiply that number by 2, that is the square footage of your filter. Example : if your grids are 18" long, you have a 36 sq ft DE Filter.

?     Asked on 11/30/2015 by Pascal Bizot

Hello i would-like to know if this is the right grids for my filter pentair fns 36. Thank you .

A     Answered on 11/30/2015 by InyoPools Product Specialist Joe S.

Hello Pascal, yes if you have the FNS plus or Nautilus these units will be the replacement grids.

?     Asked on 11/20/2015 by Mohd.Suhaili

My filter parts is: FLT FNS PLS48. Now I need to replace two complete sets of Pentair filters. Which model should I buy? Could it be: Filter Area (sq. ft.): 48 Grid, Length: 24", Identification: American, Hayward, Pac-Fab, Pentair, Sta-Rite, Full Grid Parts #: FG1004, Partial Grid Parts #: PG1904, Full Grid width: 11 - 1/2", Partial Grid Width: 9 - 1/2" ? My own measurement of the existing Full Grid width is 10 - 1/2". So it doesn't quite tally. Any advice?

A     Answered on 11/20/2015 by InyoPools Product Specialist Lennox H.

Hi Mohd, The 48 Sq. Ft. Grid Pack (7 Full & 1 Partial) (FG1004PACK) would be the correct size grid pack needed for your model filter.

?     Asked on 11/10/2015 by Jacque stretz

Is this a Hayward product?

A     Answered on 11/11/2015 by InyoPools Product Specialist Charlie R.

Jacque,No, these grids are a generic brand and not the OEM Hayward version.

?     Asked on 8/11/2015 by joe

I have a purex triton fns plus DE filter, model #fnsp 36, 2009 E, and need a replacement grid pack. Will this model fit? Thanks

A     Answered on 8/13/2015 by InyoPools Product Specialist Lennox H.

Hi Joe, The 36 Sq. Ft. Grid Pack (7 Full & 1 Partial) (FG1003PACK) will be the correct replacement size grid pack.

?     Asked on 7/29/2015 by B.H

I have a Model E-LE-42052 manufactured by Hayward but sold through LESLIES pool supply as a Crystal Clear II DE filter. Will the 36ft/2 work with this model?

A     Answered on 7/30/2015 by InyoPools Product Specialist Lennox H.

Hi B.H, The 36 Sq. Ft. Grid Pack (7 Full & 1 Partial) will work with your current Crystal Clear II 36 sqft DE filter.

?     Asked on 7/28/2015 by trish

will these work with an older hayward DE 3600 filter?

A     Answered on 7/29/2015 by InyoPools Product Specialist Hector F.

Yes this grid pack will work on the older Hayward Micro Clear D.E. 3600 model.

?     Asked on 9/14/2012 by Guest

What is the micron rating for a Unicel element?

A     Answered on 9/14/2012 by InyoPools Product Specialist Patrick P.

All Unicel elements & grids have a 20 Micron Rating.


Est. Repair Time

Less than 1 hr

Tools Needed

Adjustable Wrench

Pool filter grids had holes in them.

Written on 6/19/2018 by John S.

Drained the filter, lifted off the top and removed the filter assy. Unscrewed 2 nuts and removed the grids. Assembled the same way. Put some lube on the water inlet to assist the rubber ring seal

Were these instructions helpful? 


Est. Repair Time

Less than 1 hr

Tools Needed

Socket Set, Wrench Set

Torn filter screens

Written on 5/8/2018 by Guest

This was done while the pool was closed so the prerequisite steps of relieving pressure, draining and opening the filter were already done, and the filter assembly was already removed.

1. Using a wrench or pliers to hold the bolt at the bottom, loosen the threaded rod that runs through the filter assembly. No need to completely remove the rod.
2. Carefully pop the top plate off the individual filters - in my case, a couple were stubborn, but with some gentle persuasion, they came loose.
3. Pay close attention to where the short filter fits. It isn't that complicated if you look at where it fits in relation to the gap on the bottom plate. Also note how the screens fit in between the spacers/holders in the bottom plate.
4. I found it easiest to remove all the screens, wash off the top and bottom plates, and then re-assemble. Again, make sure the short screen is in the correct position.
5. Reposition the top plate - it can take a little bit of fiddling to get all the screens aligned with the holes in the top plate, but take your time and you'll get it.
6. Again, with a wrench on the bottom of the threaded rod, tighten from the top.
7. Confirm that there is a space for the outflow tube from the gap in the bottom plate up to the connection in the top plate. If not, you installed the short screen in the wrong place.
8. In the filter body, make sure the o-ring where the filter assembly meets the outflow tube is in good shape and is well lubricated.
9. Press the filter assembly on to the outflow tube
10. Re-assemble and recharge your filter per the instructions.

Were these instructions helpful? 


Est. Repair Time

4 to 8 hrs

Tools Needed

Socket Set

pool green and cloudy and could not get it to clear up

Written on 3/5/2017 by Guest

After changing the DE and still no improvement, I decided the filter was not working. So I pulled the top half off the filter and found that 5 of the grids were broken off where they connect to the outlet header of the filter. This allowed the water and the new DE I added to pass right through the filter and back into the pool. I went to INYOpools on internet and ordered a new set of grids for my filter and associated o-ring. I installed the new grids and new DE and within 2 days the water was clear as it should be.

Were these instructions helpful? 


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