Pentair | R173576 | Clean & Clear Plus 420 Replacement Filter Cartridge | 105 Sq Ft, Single Cartridge
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The Pentair R173576 is a genuine 105 square foot replacement cartridge for the Clean & Clear Plus 420 filter. It is the OEM part, not a compatible copy, built to the original dimensions of 7 inches in diameter by 26-1/16 inches long so it seats correctly in the manifold instead of leaning and bypassing dirty water around the edge.
Important sizing note before you order: the Clean & Clear Plus 420 uses four of these cartridges, not one. Four cartridges at 105 square feet each is what gets you the 420 square feet the filter is named for. This listing is a single cartridge. If you are doing a full changeout, order four.
Cartridge media is pleated polyester over a rigid core with molded end caps. Replace all four at once rather than mixing old and new, because a fresh cartridge next to a worn one takes an uneven share of the flow and wears out early.
If your existing cartridges are stamped 178584, that is the part number for the set of four and R173576 is the correct single replacement. Cartridges marked R173574 or R173575 from older Clean & Clear Plus 420 units also cross to this part.
Features
- Genuine Pentair OEM cartridge, not aftermarket
- 105 square feet of filtration area per cartridge
- Built to original dimensions for correct manifold seating
- Pleated polyester media over a rigid core
- Molded end caps for a consistent seal
- Reusable and hose cleanable between replacements
- Direct fit for Clean & Clear Plus 420
Specifications
- Brand: Pentair
- Manufacturer part number: R173576
- UPC: 788379502188
- Filtration area: 105 sq ft per cartridge
- Diameter: 7 in
- Length: 26-1/16 in
- End caps: 3 in open top, 3 in open bottom
- Quantity: single cartridge
- Fits: Pentair Clean & Clear Plus 420, CCP420, filters made after 11/1998
- Full set: four cartridges, 420 sq ft total
- Set part numbers: 178584, 179135 (OEM 4-pack kit)
- Cross reference: Unicel C-7471, Pleatco PCC105, Filbur FC-1977
- Application: inground swimming pool cartridge filters
Frequently Asked Questions
How many of these does my filter take?
The Clean & Clear Plus 420 takes four. This listing is one cartridge. Order four for a complete set, or look at the 179135 OEM four pack kit.
Is this 105 square feet or 420 square feet?
Each cartridge is 105 square feet. Four of them together give the filter its 420 square feet. Some listings elsewhere label the single cartridge as 420, which is wrong.
My old cartridges say 178584. Is this the right part?
Yes. 178584 is the part number for the set of four. R173576 is the single cartridge that makes up that set.
Should I replace all four at once?
Yes. A new cartridge beside a worn one takes an uneven share of the flow and wears out faster, so you end up replacing them again sooner.
How often do cartridges need replacing?
Most last two to three seasons with regular cleaning. Replace them when pressure climbs back up quickly after a cleaning, or when the pleats are matted or torn.
Can I clean these instead of replacing them?
Yes, until the media is worn. Hose them out when filter pressure rises 8 to 10 psi over the clean starting pressure, and soak them in a cartridge cleaner periodically to remove oils and scale.
Will an aftermarket cartridge work?
Compatible cartridges exist from Unicel, Pleatco, and Filbur. This listing is the genuine Pentair part, which matches OEM dimensions and media area exactly.
What is the difference between Clean & Clear and Clean & Clear Plus?
Different housings and different cartridges. Confirm your filter model before ordering, since a Clean & Clear cartridge will not fit a Clean & Clear Plus.