Pentair / Sta-Rite 25023-0172S System:3 SMD Modular D.E. Filter Module (72 Sq Ft)

The Pentair / Sta-Rite 25023-0172S is an OEM replacement modular D.E. filter module (cartridge/grid element) for Sta-Rite System:3 SMD-series modular D.E. filters. This is the internal filtration element that holds D.E. powder and provides fine filtration performance. Replacing a worn or damaged module restores normal flow, pressure, and water clarity.

Compatibility

• Fits: Sta-Rite System:3 SMD-series modular D.E. filters
• Common filter model: S7MD72 (72 sq ft System:3 modular D.E.)

Confirm your filter model number on the tank label/parts diagram before ordering to ensure you need the 72 sq ft module.

Key Specs

• Filtration area: 72 sq ft
• Type: Modular D.E. filter element / module
• Approx. dimensions: 17-1/4" x 17-1/4" x 28" (L x W x H)
• OEM part: Pentair / Sta-Rite original replacement

What This Module Does

• Provides the surface area that carries D.E. powder for fine filtration
• Helps maintain strong flow and normal system pressure when clean and properly charged with D.E.
• Restores filtration performance when the old module is torn, brittle, or permanently clogged

When to Replace

• Tears, splits, cracks, or worn areas in the fabric/structure
• D.E. returning to the pool after recharging (after ruling out valve/manifold issues)
• Chronic high pressure that does not improve after thorough cleaning
• Module is deformed, brittle, or damaged from age, chemical exposure, or overheating/run-dry events

Installation Notes

• Shut off the pump and relieve all pressure from the filter before opening the tank.
• Remove the old module and clean the inside of the tank, air bleed passages, and sealing surfaces.
• Inspect the tank O-ring and replace if flattened, cracked, swollen, or nicked; lubricate lightly with pool-safe silicone lubricant.
• Reassemble the tank and start the system, then recharge with the correct D.E. amount for your filter (follow the tank label/manual).
• Record the clean starting pressure after installation for a baseline reference.

Cleaning & Care Tips

• Rinse the module thoroughly during cleanings to remove debris and spent D.E.
• Periodically use a proper filter cleaner to remove oils/scale that can permanently restrict flow.
• Recharge with the correct D.E. amount after each backwash/cleaning to maintain filtration and protect the element.
• Never run the system without proper prime—overheating can damage the module and internal seals.

Related Products (Aqua Pool Supply)

• 25023-0172S (Search)
• System:3 SMD Tank O-Ring / Seal (Search)
• System:3 SMD Air Relief / Pressure Parts (Search)
• D.E. Filter Powder (Search)
• D.E. Filter Element Cleaner (Search)
• Pool-Safe Silicone O-Ring Lubricant (Search)

Maintenance Tips

• Clean when pressure rises about 8–10 PSI over your clean baseline (or per your service standard).
• Keep the tank O-ring clean and lightly lubricated to prevent pinching and leaks.
• If you see repeated D.E. blowback to the pool, inspect internal manifolds, air bleed parts, and valve components.