Sta-Rite 170146 replacement cartridge set for the System:3 S7M400 400 sq ft filterSta-Rite OEM Replacement Cartridge Set for System:3 Filter, 400 Sq Ft, 170146 In stock$75599
Sta-Rite 170146 replacement cartridge set for the System:3 S7M400 400 sq ft filter
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Sta-Rite OEM Replacement Cartridge Set for System:3 Filter, 400 Sq Ft, 170146

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$75599
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Quick overview

  • Both cartridges in one kit The S7M400 holds a smaller inner cartridge and a larger outer cartridge, and this set supplies one of each.
  • For the 400 sq ft System:3 Sized for the S7M400, which gets its 400 square feet of area from the pair.
  • OEM part 170146 The factory replacement set, ordered under a single part number.
  • Change them as a pair Both cartridges see the same water and the same running hours, so replacing them together keeps the filter even.
  • Restores flow Cartridges that no longer wash back to clean pressure push filter pressure up and flow down.
  • Check the model first Cartridge sets are matched to the filter, so confirm yours is the 400 square foot S7M400.
Full description and specifications ↓

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Product details

This is the OEM replacement cartridge set for the Sta-Rite System:3 S7M400 modular media filter, sold under part number 170146.

Two cartridges, one part number

The 400 square foot System:3 gets its filter area from a pair of cartridges, one smaller cartridge inside and one larger cartridge around it. This kit supplies one of each, so a single order covers the whole filter.

When to change them

Cartridges that will not wash back to clean starting pressure are finished. Because both cartridges in the S7M400 see the same water and the same running hours, changing them as a pair keeps the filter working evenly and saves opening the tank twice.

Check the model

Cartridge sets are matched to the filter they were built for. Confirm your filter is the 400 square foot S7M400 before ordering.

Specifications
Brand Sta-Rite
Manufacturer part number 170146
UPC 788379886059
Type Replacement cartridge set
Fits Sta-Rite System:3 S7M400 modular media filter
Filter area 400 sq ft
Included One small inner cartridge, one large outer cartridge
Shipping weight 35 lb
Ships Parcel

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Questions and answers

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

How many cartridges come in this kit?
Two. The S7M400 uses one smaller cartridge inside and one larger cartridge around it, and the kit includes one of each.
Which filter is this for?
The Sta-Rite System:3 modular media filter in the 400 square foot size, model S7M400.
Is this a genuine part?
Yes. It is the OEM replacement cartridge set, part number 170146.
Should I replace just the dirty one?
Both cartridges run the same hours on the same water, so replacing them together is the cleaner approach and avoids a second teardown a few months later.
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