There’s a category of pool filter that most homeowners never need — and a subset of pool owners who can’t live without. The Genesis 425 Sq Ft Cartridge Filter (GP570042507) belongs squarely in this second category. If you’re managing a large residential pool, a community pool, a hotel pool, or any body of water that demands high-volume filtration without compromise, this is the filter built for the job. Here’s what makes it stand out.
What “425 Square Feet” Actually Means
Cartridge filters are rated by the total surface area of their filter media — measured in square feet. More surface area means more filtration capacity, which translates to longer runs between cleanings and cleaner water overall.
For context: a standard residential cartridge filter might offer 100–150 sq ft of surface area, which is plenty for a typical backyard pool. The Genesis 425 Sq Ft filter offers nearly three times that capacity. This isn’t an upgrade — it’s a different class of equipment entirely.
To achieve that surface area in a manageable package, Genesis uses a quad-cartridge configuration — four cartridge elements working in parallel inside a single tank. Each element handles a portion of the water flow, and together they provide 425 sq ft of filtration surface without requiring a tank the size of a small car.
Built Like It Means It
The tank body on the Genesis 425 Sq Ft Cartridge Filter is constructed from fiberglass-reinforced polypropylene — not standard plastic. This material combination gives you the corrosion resistance of polypropylene with the structural rigidity of fiberglass reinforcement. For a filter that will see high flow rates and continuous use across multiple pool seasons, this build quality matters.
Other construction highlights:
- 2.5″ internal piping — handles high flow rates without pressure restrictions
- 2.5″ valve bulkhead unions with included 2″ reducers for flexible plumbing connections
- 1.5″ bottom clean-out port for draining and winterization
- Stainless steel pressure gauge with a “Start-Service” indicator dial — tells you exactly when it’s time to clean the cartridges
- Heavy-duty manual air relief valve for safely releasing air before opening the tank
- Flexible 3-segmented band clamp for tank access without special tools
This is the kind of component list that shows up in commercial equipment specs — and Genesis is bringing it to residential applications.
NSF Listed: What That Certification Means for You
The Genesis 425 Sq Ft Cartridge Filter carries an NSF listing — a certification from NSF International, an independent public health organization. For pool equipment, NSF certification means the filter has been independently tested and verified to meet standards for materials, design, and performance.
In practical terms: NSF-listed pool equipment has been confirmed to not introduce contaminants into the water, and to perform as advertised. When you’re running a pool that other people swim in — whether that’s your family, guests, or paying customers — NSF certification is the difference between “I think it’s fine” and “it’s been independently verified.”
Longer Cleaning Cycles: Why This Matters
One of the most practical advantages of the Genesis 425 Sq Ft filter is extended time between maintenance intervals. With 425 sq ft of filter surface area, the cartridges can capture significantly more debris before the pressure differential rises to the cleaning threshold.
For high-use pools — pools with kids jumping in all day, frequent swimmer loads, or pools surrounded by trees or landscaping — this translates directly to less frequent maintenance. Instead of cleaning cartridges every few weeks during peak season, you’re looking at intervals measured in months for most applications.
When cleaning is needed, the process is straightforward: release pressure via the air relief valve, open the band clamp, remove the cartridge elements, rinse with a garden hose, and reinstall. No backwash setup, no waste line required.
Convert to D.E. Filtration If You Want It
The Genesis 425 Sq Ft Cartridge Filter can be converted to a D.E. filter by swapping out the internal cartridge elements for D.E. grids. This convertibility is a meaningful feature for anyone who wants the option to upgrade their filtration level down the road without replacing the entire tank and plumbing setup.
D.E. filtration catches particles as small as 2–5 microns — the finest filtration available for pool water. If you start with cartridge filtration and decide you want that extra level of clarity later, this filter gives you a path to get there.
Specs Summary
| Spec | Detail |
|---|---|
| Filtration area | 425 sq ft |
| Configuration | Quad-cartridge |
| Body material | Fiberglass-reinforced polypropylene |
| Internal piping | 2.5″ |
| Valve connections | 2.5″ bulkhead unions (2″ reducers included) |
| Drain port | 1.5″ bottom clean-out |
| Pressure gauge | Stainless steel with Start-Service dial |
| Certification | NSF Listed |
| Convertible | Yes — to D.E. filter |
| Origin | Made in the USA |
| Warranty | 3 years |
Who Is This Filter For?
The Genesis 425 Sq Ft Cartridge Filter is the right call for:
- Large residential pools (35,000+ gallons) where standard residential filters can’t keep up
- High-bather-load pools — pools with frequent and heavy use that push debris accumulation rates up
- Commercial and semi-public pools — hotels, HOA pools, rental properties — where NSF listing and equipment reliability aren’t optional
- Pool owners who want to eliminate backwash lines entirely — cartridge filtration requires no backwash discharge, making it ideal where drain access is limited
- Anyone who wants the option to upgrade to D.E. filtration later without replacing the whole system
Pairing Your Pump — And a Smaller-Pool Alternative
The Genesis 425 Sq Ft Cartridge Filter is a standalone filter and does not include a pump. To get peak performance, pair it with a pump rated for the flow rate your pool requires. The Genesis 2.7 THP Variable Speed IG Pump is an excellent match for large pools with high flow demands — and its variable-speed functionality lets you dial in the right flow rate for filtration versus feature operation.
If your pool is on the smaller side and a 425 sq ft filter is more capacity than you need, the Genesis 150 Sq Ft Cartridge Filter with 2 HP Pump bundle gives you everything in one package at a fraction of the cost.
Genesis GPPD270 2.7 THP Variable Speed IG Pump, 3-Year Warranty
Recommended pairing — 2.7 THP variable-speed in-ground pump dialed in for high-flow filtration.
Genesis 150 Sq Ft Cartridge Filter with 2 HP Pump, GP52051673S, 3-Year Warranty
Smaller-pool alternative — 150 sq ft cartridge filter bundled with a 2 HP pump for mid-size residential pools.
Order Yours from PST Pool Supplies
The Genesis 425 Sq Ft Cartridge Filter ships with free shipping from PST Pool Supplies. If you’re comparing filters, browse the full Genesis Pool Filters collection or shop all Genesis Pool Equipment for pumps, bundles, and more.