Pentair
Pentair Element Grid Support, 2" | 23900-0350
Pentair Element Grid Support, 2" | 23900-0350
Pentair Sta-Rite element grid support 23900-0350 has been discontinued and is no longer available from the manufacturer.
This listing is maintained for product identification, compatibility, specifications and filter-repair reference only. This exact grid support cannot be ordered or backordered through Aqua Terra Backyard.
No direct Pentair replacement has been identified. Do not substitute the larger S8D110 grid support, part 23901-0350, because it is designed for a different filter and grid assembly.
Pentair Sta-Rite S7D75 Element Grid Support, 2-Inch | 23900-0350
Pentair 23900-0350 is the lower element grid support used inside the Sta-Rite System:3 S7D75 vertical-grid diatomaceous earth filter. The support sits beneath the filter elements and helps keep the individual grids positioned correctly within the complete internal filter assembly.
The grid support works with the upper collection manifold, center rods, wing nuts, air-bleed assembly and multiple filter elements to form the complete S7D75 grid pack. Correct grid alignment helps maintain an even D.E. coating and reduces the opportunity for unfiltered water or D.E. powder to bypass the elements.
This listing identifies one original Pentair Sta-Rite grid support only. Filter elements, manifold, center rods, wing nuts, air-bleed components and the complete filter assembly are not included.
What the Grid Support Does
- Supports the lower ends of the S7D75 filter grids
- Helps maintain spacing between individual filter elements
- Keeps the internal grid assembly properly aligned
- Works with the manifold and center rods during assembly
- Supports even D.E. distribution across the filter elements
Common Reasons for Replacement
- Cracked or broken molded support sections
- Grid openings that no longer hold elements securely
- Warping or distortion inside the filter tank
- Loose or misaligned filter-grid assembly
- Damage discovered during a complete filter rebuild
Product Features
- Genuine Pentair Sta-Rite component: Originally manufactured for the internal filter-element assembly used in the Sta-Rite System:3 S7D75 D.E. filter.
- Lower grid positioning: Supports and spaces the lower ends of the filter elements while the upper manifold holds the opposite ends.
- Internal structural support: Helps the grid pack remain stable as the filter fills, operates and is recharged with diatomaceous earth.
- Model-specific design: Intended for the S7D75 filter and not the larger S8D110 model.
- Individual repair component: Allows the support to be identified separately from the complete 23900-1220S S7D75 filter-element assembly.
- Legacy repair reference: Maintained online to help pool professionals and equipment owners identify components removed from older System:3 filters.
Product Specifications
| Manufacturer | Pentair |
|---|---|
| Brand | Sta-Rite |
| Manufacturer Part Number | 23900-0350 |
| Common Distributor Item Number | 602899 |
| Product Name | Element Grid Support |
| Product Type | Lower support for a vertical-grid D.E. filter assembly |
| Size Designation | 2-inch |
| Compatible Filter Family | Sta-Rite System:3 SD Series D.E. filters |
| Confirmed Filter Model | S7D75 |
| Filter Area | 75 square feet |
| Installation Location | Bottom of the internal S7D75 filter-grid assembly |
| Quantity Used Per S7D75 | 1 grid support |
| Complete Filter-Element Assembly | 23900-1220S, sold separately and also discontinued |
| S7D75 Collection Manifold | 24800-0100, sold separately |
| Center Rod | 23900-0039, sold separately |
| Air-Bleed Assembly | 24800-0120, sold separately |
| Wing Nut | 35402-0074Z, sold separately |
| Filter Elements Included | No |
| Manifold Included | No |
| Hardware Included | No |
| Current Availability | Discontinued and no longer available |
| Direct Pentair Replacement | No direct replacement currently identified |
23900-0350 Is for the S7D75 Filter
Pentair used different grid supports in the two System:3 SD Series filter sizes. Part 23900-0350 is the support associated with the S7D75 grid assembly.
The larger S8D110 filter uses grid support 23901-0350. The two part numbers should not be treated as interchangeable because the filter diameter, grid arrangement and internal support dimensions differ.
- S7D75 grid support: 23900-0350
- S8D110 grid support: 23901-0350
- S7D75 complete element assembly: 23900-1220S
- S8D110 complete element assembly: 23900-1221S
Inspection and Service Guidance
Shut off the circulation pump, disconnect electrical power and fully relieve filter pressure through the manual air-relief valve before opening the filter tank.
- Confirm the filter model is S7D75
- Inspect the support for cracks, warping and missing sections
- Inspect every grid neck and lower edge for damage
- Check the upper collection manifold for cracks
- Inspect the center rods and wing nuts for corrosion or damage
- Clean and inspect the internal air-bleed assembly
- Verify each grid is seated in the correct support opening
- Check the tank sealing surface and tank O-ring
- Reassemble the clamp system according to Pentair instructions
- Recharge the filter with the specified amount of D.E.
Frequently Asked Questions
Is Pentair 23900-0350 still available?
No. Pentair Sta-Rite grid support 23900-0350 has been discontinued and is no longer available through Aqua Terra Backyard. This page remains online for identification and filter-repair reference.
What is Pentair part 23900-0350?
It is the lower element grid support used inside the Sta-Rite System:3 S7D75 vertical-grid D.E. pool filter.
Which filter uses 23900-0350?
The confirmed application is the Sta-Rite System:3 S7D75 D.E. filter. The model number should be verified from the filter tank label before identifying internal parts.
Does 23900-0350 fit the S8D110?
No. The S8D110 uses a different element grid support, part number 23901-0350.
Does this listing include the complete grid assembly?
No. Part 23900-0350 identifies the lower grid support only. It does not include filter grids, the collection manifold, center rods, wing nuts, air-bleed assembly or the complete filter-element pack.
What does the element grid support do?
It positions and supports the lower ends of the individual filter grids so the complete internal assembly remains properly spaced and aligned.
Can a damaged grid support cause D.E. to return to the pool?
A damaged support may allow grids to shift or become improperly seated, which can contribute to filtration bypass. Torn grids, cracked manifolds and damaged outlet connections can cause the same symptom.
Is there a direct replacement for 23900-0350?
No confirmed direct Pentair replacement is currently identified. Repair planning requires inspection of the complete S7D75 grid pack and the availability of the remaining service components.
Can the S8D110 support be modified to fit?
Modification is not recommended. The S8D110 uses a different grid arrangement and support part number. Altering a pressurized filter's internal components may cause poor alignment, D.E. bypass or damage to the grid pack.
Should the grids be inspected when servicing the support?
Yes. Inspect all grid fabric, seams, necks and frames while the assembly is removed. Replacing or repairing the support cannot correct filtration bypass caused by a torn grid.
Need Help Identifying a Sta-Rite System:3 Filter Part?
Match the tank model, square-foot rating, complete part number and internal grid configuration before planning a filter repair.
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