Pentair 170145 cartridge pack for Sta-Rite System 3 S7M120, inner and outer cartridgesSta-Rite 170145 System 3 S7M120 Large and Small Cartridge Set, 25021-0200S and 25022-0201S In stock$47999
Pentair 170145 cartridge pack for Sta-Rite System 3 S7M120, inner and outer cartridges
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Sta-Rite 170145 System 3 S7M120 Large and Small Cartridge Set, 25021-0200S and 25022-0201S

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$47999
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Quick overview

  • Both cartridges in one pack the 25021-0200S inner and 25022-0201S outer elements the S7M120 needs.
  • Genuine Pentair OEM cartridges made for the Sta-Rite System 3 SM-Series 21 in. filter.
  • Nested design the inner cartridge sits inside the outer one and the two filter together.
  • Inner cartridge 11 in. by 11 in. by 31.25 in.
  • Outer cartridge 19 in. by 19 in. by 23 in.
  • Restores flow and clarity worn cartridges raise filter pressure and let fine debris through.
Full description and specifications ↓

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Product details

Pentair 170145 is the genuine replacement cartridge pack for the Sta-Rite System 3 S7M120, the 21 in. modular media filter. It contains both elements the filter uses: the 25021-0200S inner cartridge and the 25022-0201S outer cartridge.

Two cartridges that work as one

The System 3 nests a smaller cartridge inside a larger one. The inner element measures 11 in. by 11 in. by 31.25 in. and the outer 19 in. by 19 in. by 23 in. Together they give the filter its full surface area, which is why replacing only one of them rarely brings performance back.

When to replace

Cartridges are cleaned many times over their life, but eventually hosing no longer returns the pressure gauge to its clean reading, and pleats start to fray or collapse. That is the point to fit a new pack rather than keep cleaning.

Before you order

This pack fits the S7M120 only. The S8M150, S7M400 and S8M500 in the same family take different cartridges. The model is on the tank label.

Specifications
Brand Sta-Rite (Pentair)
Manufacturer part number 170145
UPC 788379886042
Fits Sta-Rite System 3 SM-Series 21 in. cartridge filter, model S7M120
Includes 25021-0200S inner cartridge and 25022-0201S outer cartridge
Inner cartridge dimensions 11 in. x 11 in. x 31.25 in.
Outer cartridge dimensions 19 in. x 19 in. x 23 in.
Genuine OEM Yes
Shipping weight 29.65 lb
Ships Parcel

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Questions and answers

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

Does this fit the S8M150 or other System 3 sizes?
No. This pack is sized for the 21 in. S7M120. The S8M150, S7M400 and S8M500 use different cartridges. Check the model plate on your tank before ordering.
Do I need to buy the inner and outer cartridges separately?
No. Pentair 170145 includes both, the 25021-0200S inner and the 25022-0201S outer.
How do I know it is time to replace them?
When cleaning no longer brings filter pressure back to its clean baseline, or the pleats are frayed, cracked or collapsing, the cartridges are done.
Can I clean and reuse them?
Yes, routine hosing between replacements is normal. Replacement is for when cleaning stops restoring flow.
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