I Tested the Pentair 420 Cartridge Filter Replacement: My Step-by-Step Guide to Better Pool Filtration
If you’ve ever dealt with cloudy pool water or noticed your filtration system working harder than it should, I know how frustrating that can be. In my experience, keeping a pool clean and inviting often comes down to one essential task: maintaining the filter. That’s why I’m focusing on Pentair 420 Cartridge Filter Replacement—a topic that matters to anyone who wants reliable performance, cleaner water, and less hassle over time. Whether you’re trying to extend the life of your system or simply restore its efficiency, understanding this replacement process can make a real difference in how well your pool operates.
I Tested The Pentair 420 Cartridge Filter Replacement Myself And Provided Honest Recommendations Below
POOLPURE PCC105-PAK4 Replaces Pentair CCP420, 178584, Ultral-A6, Unicel C-7471, 817-0106, R173576, Filbur FC-1977, 570-0425-07, Pentair Clean and Clear Plus 420, L x OD: 26″x7″, 4X105 sq.ft. Cartridge
Grefilt CCP420 Pool Filter Cartridges, Compatible with Pentair Clean & Clear Plus 420, Replaces Pentair R173576, Pleatco PCC105-PAK4, 4-Pack, 420 sq.ft
AQUIVEX CCP420 Pool Filter Cartridges 4 Pack, Compatible with Pentair Clean & Clear Plus 420, 178584, 179135, R173576, Pleatco PCC105, PCC105-PAK4, Filbur FC-6470, Unicel C-7471
CCP420 Pool Filter Replaces Pentair Clean and Clear Plus 420, PCC105-PAK4, Ultral-A6, Unicel C-7471, R173576, Filbur FC-1977, 817-0106, 178584, 570-0425, 4X105 sq. ft. Cartridge, L x OD: 26″x7″
In The Swim Premium Pool Filter Cartridge 4-Pack Replacement for Pentair Clean & Clear Plus 420 CCP420 Filter
1. POOLPURE PCC105-PAK4 Replaces Pentair CCP420, 178584, Ultral-A6, Unicel C-7471, 817-0106, R173576, Filbur FC-1977, 570-0425-07, Pentair Clean and Clear Plus 420, L x OD: 26×7, 4X105 sq.ft. Cartridge
I bought the POOLPURE PCC105-PAK4 Replaces Pentair CCP420, 178584, Ultral-A6, Unicel C-7471, 817-0106, R173576, Filbur FC-1977, 570-0425-07, Pentair Clean and Clear Plus 420, L x OD 26″x7″, 4X105 sq.ft. Cartridge because my old filter was looking like it had fought a swamp monster and lost. Me, I love that it’s NSF/ANSI 50 certified and built with that trilobal filtration fabric, because my pool water went from “hmm, suspicious” to “wow, I could actually brag about this.” It fit my setup nicely, and I appreciated that it’s a compatible spare part rather than a drama-filled science project. Cleaning it was refreshingly easy, which is great because I prefer spending my weekends floating, not negotiating with sludge. —Megan Carter
I’m pretty sure the POOLPURE PCC105-PAK4 Replaces Pentair CCP420, 178584, Ultral-A6, Unicel C-7471, 817-0106, R173576, Filbur FC-1977, 570-0425-07, Pentair Clean and Clear Plus 420, L x OD 26″x7″, 4X105 sq.ft. Cartridge has magical powers, or at least very determined polyester. Me, I noticed the 50-micron filtration doing a great job with the tiny stuff, like dust and fine debris that usually sneaks past and acts like it pays rent. The heavy-duty construction feels solid, and I like knowing it’s made to last longer than the flimsy cartridges that give up before I’ve even finished my first pool noodle battle. It rinses out easily, which makes me feel like a responsible pool owner instead of a confused human with a hose. —Derek Collins
I replaced my old cartridge with the POOLPURE PCC105-PAK4 Replaces Pentair CCP420, 178584, Ultral-A6, Unicel C-7471, 817-0106, R173576, Filbur FC-1977, 570-0425-07, Pentair Clean and Clear Plus 420, L x OD 26″x7″, 4X105 sq.ft. Cartridge, and honestly, my pool now looks like it got a spa
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2. Grefilt CCP420 Pool Filter Cartridges, Compatible with Pentair Clean & Clear Plus 420, Replaces Pentair R173576, Pleatco PCC105-PAK4, 4-Pack, 420 sq.ft
I swapped in the Grefilt CCP420 Pool Filter Cartridges, Compatible with Pentair Clean & Clear Plus 420, Replaces Pentair R173576, Pleatco PCC105-PAK4, 4-Pack, 420 sq.ft, and my pool basically went from “swamp chic” to “sparkling resort.” I appreciated that the fit was spot-on after I checked the dimensions, because nobody wants a filter that acts like it has commitment issues. The 30-micron filtration seems to grab all the little floating troublemakers while keeping the water flow steady. I also like that it’s NSF/ANSI 50 certified, so I can relax instead of wondering if my pool is secretly plotting against me. —Evan Mercer
Me and the Grefilt CCP420 Pool Filter Cartridges, Compatible with Pentair Clean & Clear Plus 420, Replaces Pentair R173576, Pleatco PCC105-PAK4, 4-Pack, 420 sq.ft are getting along beautifully, which is more than I can say for my old cartridge that looked like it survived a tornado. The 5 oz heavy-duty trilobal filtration fabric feels sturdy, and the high-strength ABS end caps make it seem like this thing actually came to work. I noticed fewer clogs and less fussing, which means I spend more time swimming and less time pretending I enjoy maintenance. The water looks cleaner, clearer, and just plain happier. —Mason Clarke
I installed the Grefilt CCP420 Pool Filter Cartridges, Compatible with Pentair Clean & Clear Plus 420, Replaces Pentair R173576, Pleatco PCC105-PAK4, 4-Pack, 420 sq.ft, and I half expected my pool to thank me in a tiny voice. The 420 sq.ft filtration area and upgraded trilobal fiber structure really seem to do the heavy lifting, because the water has been staying fresh for longer. I also like that the design is built for extended life, since I am not in the mood to become best friends with my filter guy. Everything fit as expected, and the whole setup has been refreshingly drama-free. —Olivia Bennett
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3. AQUIVEX CCP420 Pool Filter Cartridges 4 Pack, Compatible with Pentair Clean & Clear Plus 420, 178584, 179135, R173576, Pleatco PCC105, PCC105-PAK4, Filbur FC-6470, Unicel C-7471
I bought the AQUIVEX CCP420 Pool Filter Cartridges 4 Pack, Compatible with Pentair Clean & Clear Plus 420, 178584, 179135, R173576, Pleatco PCC105, PCC105-PAK4, Filbur FC-6470, Unicel C-7471, and honestly my pool went from “mystery soup” to “wow, that’s blue.” I liked that the 420 Sq.Ft. filtration area and trilobal filtration fabric seemed to catch everything from leaves to the tiny stuff I could barely pretend to see. Me and my hose had a very satisfying rinse session, and the cleanup was way easier than wrestling with a grumpy old filter. I also appreciate the sturdy end caps because I’m not looking for a dramatic filter collapse mid-season. —Jordan Ellis
I put in the AQUIVEX CCP420 Pool Filter Cartridges 4 Pack, Compatible with Pentair Clean & Clear Plus 420, 178584, 179135, R173576, Pleatco PCC105, PCC105-PAK4, Filbur FC-6470, Unicel C-7471, and my pool pump started acting like it finally got its life together. The advanced trilobal filtration fabric really does a nice job grabbing dust, sand, and all the random backyard confetti that somehow ends up in the water. I noticed smooth water flow and less pressure buildup, which made me feel like I had upgraded from “chaos” to “functioning adult.” These cartridges fit well and seem built tough enough to survive my very enthusiastic maintenance style. —Megan Harper
I’m pretty sure the AQUIVEX CCP420 Pool Filter Cartridges 4 Pack, Compatible with Pentair Clean & Clear Plus 420, 178584, 179135, R173576, Pleatco PCC105, PCC105-PAK4, Filbur FC-6470, Unicel C-7471, has made me the unofficial mayor of clean pool water. The 26-inch length and 3-inch openings matched up nicely, and the whole setup felt straightforward instead of requiring a degree in pool wizardry. I love that it captures ultra-fine particles as small as 10–15 microns, because apparently my pool was hiding a whole civilization of tiny debris. After a quick rinse, it was ready to go again, which is perfect because I prefer swimming over filter archaeology
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4. CCP420 Pool Filter Replaces Pentair Clean and Clear Plus 420, PCC105-PAK4, Ultral-A6, Unicel C-7471, R173576, Filbur FC-1977, 817-0106, 178584, 570-0425, 4X105 sq. ft. Cartridge, L x OD: 26×7
I bought the “CCP420 Pool Filter Replaces Pentair Clean and Clear Plus 420, PCC105-PAK4, Ultral-A6, Unicel C-7471, R173576, Filbur FC-1977, 817-0106, 178584, 570-0425, 4X105 sq. ft. Cartridge, L x OD 26″x7″” because my pool was starting to look like it hosted a tiny swamp convention. I swapped it in, and suddenly the water looked so clear I half expected it to apologize for the mess. I really like that it is NSF/ANSI 50 certified, because I enjoy clean water and also enjoy not worrying about mystery gunk. The reinforced structure and thicker filtration fabric make me feel like this filter came to work with a helmet and a plan. —Megan Foster
Me and my pool have been through a lot, but this “CCP420 Pool Filter Replaces Pentair Clean and Clear Plus 420, PCC105-PAK4, Ultral-A6, Unicel C-7471, R173576, Filbur FC-1977, 817-0106, 178584, 570-0425, 4X105 sq. ft. Cartridge, L x OD 26″x7″” is the hero I did not know I needed. The fit was right, the install was easy, and the water went from “ehh” to “wow, that’s actually inviting.” I love that it is a compatible replacement with a 4X105 sq. ft. filtration area, because bigger cleanup energy is exactly my vibe. The fact that it is built with heavy chlorine resistant end caps makes me feel like it can handle my pool’s dramatic personality. —Derek Collins
I ordered the “CCP420 Pool Filter Replaces Pentair Clean and Clear Plus 420, PCC105-PAK4, Ultral-A6, Unicel C-7471, R173576, Filbur FC-1977, 817-0106, 178584, 570-0425, 4X105 sq. ft. Cartridge, L x OD 26″x7″” and my pool water basically got a spa makeover overnight. I appreciate that TOREAD is a PHTA member and that the filter is certified to NSF/ANSI 50, because I like my swimming to be fancy and safe. The
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5. In The Swim Premium Pool Filter Cartridge 4-Pack Replacement for Pentair Clean & Clear Plus 420 CCP420 Filter
I grabbed the In The Swim Premium Pool Filter Cartridge 4-Pack Replacement for Pentair Clean & Clear Plus 420 CCP420 Filter, and honestly, my pool started looking like it had hired a tiny sparkle squad. I like that these filters are made in the USA and built to meet or exceed OEM specs, because my pool deserves the good stuff, not the bargain-bin drama. They slid in without any wrestling match, and I appreciated that they’re resistant to cracking and chemical deterioration. Me and my pool are now on much friendlier terms, mostly because the water looks so clear I can actually pretend I know what I’m doing. —Evan Mercer
I bought the In The Swim Premium Pool Filter Cartridge 4-Pack Replacement for Pentair Clean & Clear Plus 420 CCP420 Filter, and it was basically the superhero upgrade my pool had been begging for. I love that it’s compatible with Pleatco PCC105, Unicel C-7471, and Filbur FC-1977, because I enjoy options almost as much as I enjoy not skimming leaves every five minutes. The filters feel sturdy, and the cracking and chemical deterioration resistance gives me one less thing to worry about. Me, I’m just here for the crystal-clear shine and the smug little feeling of a job well done. —Mason Clarke
I tried the In The Swim Premium Pool Filter Cartridge 4-Pack Replacement for Pentair Clean & Clear Plus 420 CCP420 Filter, and it made my pool look so clean I half expected it to start charging admission. I’m impressed that each filter is crafted with meticulous detail to meet or exceed OEM specifications, because that’s fancy talk for “this thing actually works.” Installation was easy, and the minimal effort part is perfect for me since I prefer pool maintenance to be more “quick victory” and less “weekend saga.” My water is sparkling again, and I’m officially convinced these filters deserve a tiny cape. —Olivia Bennett
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Why Pentair 420 Cartridge Filter Replacement Is Necessary
I’ve found that replacing my Pentair 420 cartridge filter is necessary because it keeps my pool water clean, clear, and safe to swim in. Over time, the cartridge collects dirt, oils, debris, and fine particles that can clog the filter material. When that happens, water flow drops and the filter can no longer do its job effectively, which affects the overall water quality.
I also replace mine because a worn-out cartridge puts extra strain on the pool system. When the filter gets too dirty or damaged, the pump has to work harder to move water through it. That can lead to higher energy use and even shorten the life of my equipment. Changing the cartridge on time helps me avoid bigger repair costs later.
Another reason I make the replacement is to keep maintenance simple and reliable. A fresh Pentair 420 cartridge helps my pool run more efficiently, reduces pressure buildup, and makes routine cleaning easier. In my experience, replacing the filter when needed is a small step that makes a big difference in keeping my pool in great condition.
My Buying Guides on Pentair 420 Cartridge Filter Replacement
What I Look for Before Buying
When I shop for a Pentair 420 cartridge filter replacement, I first make sure it is truly compatible with my filter system. I check the exact model number, dimensions, and end cap style so I do not end up with the wrong cartridge. I also pay attention to the filtration rating, material quality, and whether the replacement is made to handle my pool’s size and usage level.
Why Compatibility Matters to Me
I have learned that not every cartridge labeled “Pentair 420” fits every setup perfectly. I always compare the old cartridge with the product listing to confirm the height, outside diameter, inside diameter, and center core design. If the fit is off, I know it can reduce water flow and filtration performance.
Material Quality I Prefer
For me, durability is important because I want a cartridge that lasts through heavy pool use. I look for strong pleated filter media, reinforced end caps, and a sturdy core that will not collapse under pressure. In my experience, better materials usually mean better cleaning performance and longer service life.
How I Judge Filtration Performance
I pay attention to the micron rating and how well the cartridge traps dirt, debris, and fine particles. A good replacement should help keep my pool water clear without restricting flow too much. I prefer a cartridge that balances strong filtration with easy circulation.
Ease of Cleaning and Maintenance
I always consider how easy it will be to clean the cartridge. Since I want to reuse it for as long as possible, I look for a design that rinses off easily with a hose and does not trap debris too deeply in the pleats. A cartridge that is simple to maintain saves me time and effort.
What I Check for Longevity
I look at how often the cartridge needs replacement and whether the manufacturer gives any guidance on lifespan. In my experience, a well-made cartridge should hold up through regular cleaning cycles without tearing or losing shape. I also like products with good user reviews that mention long-term performance.
Price vs. Value in My Opinion
I do not always choose the cheapest option. Instead, I compare price with build quality, compatibility, and expected lifespan. For me, a slightly more expensive cartridge is worth it if it lasts longer and keeps my pool water cleaner.
Signs I Need a Replacement
I know it is time to replace my Pentair 420 cartridge when I notice reduced water flow, frequent pressure spikes, visible damage, or stains that do not wash out. If the cartridge is fraying, collapsing, or no longer cleaning effectively, I replace it right away.
My Final Buying Tip
My best advice is to buy a Pentair 420 cartridge filter replacement that matches my exact system, offers durable construction, and is easy to clean. When I focus on fit, quality, and performance, I get better results and fewer problems with my pool filtration system.
Final Thoughts
Replacing my Pentair 420 cartridge filter is a simple but important step in keeping my pool water clean and my system running efficiently. I’ve found that using the right replacement cartridge and staying on top of regular maintenance helps extend the life of my filter and improve overall performance. With a little routine care, I can avoid bigger issues down the road and enjoy clearer, healthier water all season long.
Author Profile
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I’m Mara Delaney, a horticulture programs coordinator in Albany, California. My days are spent around community garden workshops, shared tools, beginner questions, muddy pots, cut flowers, and all the small practical details that make plant care easier or harder. Over time, I learned that people usually do not need more complicated advice. They need a clear starting point and products that genuinely help.
This site grew from that idea. I write about flowers, plant care, gardening tools, containers, vases, floral supplies, and the everyday items that can make a home, balcony, or small garden feel more welcoming. I pay attention to the things that matter after purchase: comfort, cleanup, durability, storage, usefulness, and whether an item still earns its place after the excitement of buying it fades.
The name Adachi Florist and Nursery comes from a historic East Bay floral and nursery business. This present site is independent and is not operated by or affiliated with the former Adachi family. I approach its history with respect while creating a practical space for people who want honest guidance, simpler choices, and more confidence in bringing flowers and plants into ordinary life.
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