Pleatco Ultra-A6 CCP420 Filter Cartridges 4-Pack | 179135

Key Benefits + Filter Compatibility

• Pentair Pleatco Ultra replacement cartridge set SKU 179135 includes four cartridges for the Pentair Clean & Clear® Plus 420 cartridge filter.
• Provides 420 square feet of total filtration area, with approximately 105 square feet of media per cartridge.
• Pleatco model ULTRA-A6-PAK4 is identified in Pentair’s current parts catalog as the four-cartridge Ultra set for the Clean & Clear Plus 420.
• PurePleat™ technology helps reduce pleat bunching and makes trapped debris easier to rinse from the cartridge surface.
• Point Bonded filtration fabric is designed for consistent media stability and dirt capture.
• Free Flow Core construction creates additional pathways for water to reach the filter media.
• Replaces all four filter elements together to support balanced water flow and even debris loading throughout the filter tank.
• Each cartridge measures approximately 7 inches in diameter by 26-1/16 inches long, with 3-inch open top and bottom connections.
• Commonly associated with individual Pentair replacement cartridge number R173576.
• Before ordering, confirm that the equipment label identifies the filter as a Pentair Clean & Clear Plus 420 or CCP420.

Pentair identifies ULTRA-A6-PAK4 as the Pleatco Ultra four-pack for the Clean & Clear Plus 420, while Pleatco’s Ultra design combines PurePleat, Point Bonded fabric, and a Free Flow Core.

Quick Product Summary

The Pentair Pleatco Ultra-A6 cartridge set is a complete four-pack replacement for the Pentair Clean & Clear Plus 420 pool filter. Identified by SKU 179135, this set provides 420 square feet of total filtration area and is designed to restore effective debris capture and balanced flow when the original cartridges have become worn, damaged, or difficult to clean.

Explore additional pool filter cartridges for other filter sizes and equipment models.

Best For

• Pentair Clean & Clear Plus 420 cartridge filters
• Residential in-ground pool filtration systems
• Replacing all four cartridges as a balanced set
• Filters with worn, damaged, or heavily embedded cartridges
• Pool owners comparing Pleatco Ultra and other CCP420 replacement options
• Systems requiring four 105-square-foot cartridge elements

Why This Matters

• Restores the filter’s full 420-square-foot media capacity
• Helps capture dirt, debris, and suspended particles
• Supports balanced flow across all four cartridges
• Helps reduce uneven loading caused by mixing old and new cartridges
• Replaces cartridges with torn pleats, damaged end caps, or deteriorated media
• Makes routine cartridge cleaning and inspection easier
• Helps maintain proper filtration without replacing the complete filter tank
• Provides clear model and part identification to reduce wrong-cartridge orders

Common Signs You Need This / Use This When

• Cartridge pleats are torn, flattened, frayed, or separating
• End caps or internal cores are cracked or damaged
• Support bands are loose, broken, or missing
• Filter pressure rises again shortly after the cartridges are cleaned
• Embedded oils, scale, or debris cannot be fully removed
• Water clarity does not improve after proper cleaning and water balancing
• The cartridges no longer fit securely around the upper and lower manifolds
• You are servicing a Clean & Clear Plus 420 and want to replace all four elements together

Torn pleats, fraying bands, cracked end caps, and repeated pressure increases after cleaning are practical indications that cartridge replacement may be necessary.

Product Specifications

The model, quantity and CCP420 application are supported by Pentair’s catalog and industry listings. The UPC associated with Pentair SKU 179135 is 788379886202.

Compatibility / Fitment Notes

This four-pack is designed for the Pentair Clean & Clear Plus 420, commonly identified as the CCP420. The filter uses four matching cartridges to provide a combined 420 square feet of filtration area.

Do not select cartridges solely by appearance. Pentair produces Clean & Clear Plus filters in several capacities, including 240, 320, 420 and 520 square feet, and the cartridge lengths differ between models.

Before ordering:

• Read the model number on the filter tank label.
• Confirm that the filter is a Clean & Clear Plus 420 or CCP420.
• Compare the existing cartridge’s diameter, length and opening sizes.
• Confirm SKU 179135 or the ULTRA-A6-PAK4 reference.
• Do not substitute cartridges made for the CCP320 or CCP520.

For another compatible cartridge option, compare the Unicel C-7471-4 CCP420 cartridge set.

Installation / Use Notes

Turn the circulation pump off and completely relieve pressure from the filter tank before loosening the clamp or opening the filter. Never attempt to open, tighten, or service a pressurized pool filter.

Remove the existing cartridges and inspect the manifolds, air-bleed assembly, tank O-ring and clamp components before installing the new set. Position each cartridge correctly between the lower and upper manifolds, then reassemble the filter according to the Pentair instructions.

After restarting the system, bleed trapped air from the filter and record the clean starting pressure. Clean the cartridges as operating pressure and pool conditions require. Find replacement gauges, O-rings, air-bleed components and clamp parts in our pool filter parts collection. Pentair warns that air and pressure must be fully relieved before servicing a Clean & Clear Plus filter.

Buy with Confidence

Benchmark Pool Supply helps pool owners and service professionals match replacement cartridges by filter model, cartridge dimensions and manufacturer part number. Clear equipment identification is especially important because Clean & Clear Plus 320, 420 and 520 filters use similar-looking but differently sized cartridge sets.

Shop additional Pentair pool parts, complete pool filters, and professional filtration components from a pool supply team familiar with real-world equipment service.