Jacuzzi 4638-03B DE filter grid, 7 inches by 18 inchesJacuzzi DE Filter Grid 7" x 18" (2 Required), 4638-03B In stock$4999
Jacuzzi 4638-03B DE filter grid, 7 inches by 18 inches
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Jacuzzi DE Filter Grid 7" x 18" (2 Required), 4638-03B

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$4999
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Quick overview

  • Two per filter The grid stack uses two of this size, so order the pair unless only one has failed.
  • Seven by eighteen inches The narrower grid in the stack, distinct from the wider 8-1/2 inch grids.
  • Earthworks original style Listed for the Jacuzzi Earthworks EW75, EW100, EW125 and EW150 filters.
  • Genuine part 4638-03B The Jacuzzi part number, rather than a generic grid cut to size.
  • Where DE actually sits The grid fabric is what holds the DE coat that does the filtering.
  • Replace on damage A torn grid pushes DE back to the pool and shows up as powder on the floor.
Full description and specifications ↓

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Product details

Jacuzzi 4638-03B is a 7 inch by 18 inch DE filter grid. Two are required, and it is listed for the Jacuzzi Earthworks original style filters, models EW75, EW100, EW125 and EW150.

What a grid does

A DE filter does not filter with the grid itself. The grid is a fabric covered frame, and the diatomaceous earth you add through the skimmer coats that fabric. The coat is the filter. The grid just holds it in the right shape and lets clean water pass through to the manifold.

Why they fail

Grid fabric wears at the seams and tears where debris has been trapped against it. Once a grid is open, DE goes straight through it and back to the pool, which is why fine white powder on the floor after a recharge points at the grid stack. Pull the stack, rinse it and look for damage before you replace anything.

Ordering

This is the narrower of the two sizes in the stack, and the wider grids are a separate part. Count and measure what you are removing.

Specifications
Brand Jacuzzi
Manufacturer part number 4638-03B
Type DE filter grid
Size 7" x 18"
Quantity required 2
Fits Jacuzzi Earthworks original style EW75, EW100, EW125, EW150 filters
Shipping weight 0.88 lb
Ships Parcel

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Questions and answers

What people ask about this product, answered by our pool techs.

How many of these do I need?
Two. This size is used in pairs in the grid stack.
Which filters does it fit?
The Jacuzzi Earthworks original style DE filters, models EW75, EW100, EW125 and EW150.
Is this the only grid size in the filter?
No. The stack also uses a wider grid, so check the size of the one you are replacing before ordering.
How do I know a grid has failed?
DE powder coming back into the pool through the returns is the classic sign. Pull the stack and look for tears in the fabric or a split at the manifold end.
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