Unicel Replacement Filter Cartridge 52 sf Dimension One Spas | 7CH-552
Unicel
SKU: 7CH-552
Unicel 7CH-552 Replacement Spa Filter Cartridge – 52 Sq Ft (7" OD x 10-1/2" Length, Handle Top, 2" MPT Bottom)
The Unicel 7CH-552 is a replacement pleated spa filter cartridge commonly used in select Dimension One (D1) “top load” style filter canisters. It features a top handle for easy removal and a 2" male pipe thread (MPT) connection on the bottom for a secure, threaded fit in compatible housings. Replacing a worn cartridge helps restore circulation, improve water clarity, and reduce strain on spa pumps and heaters.
Key Features
- Nominal filtration area: 52 sq ft (often listed in the 52–55 sq ft class depending on catalog)
- Top: handle for quick removal during cleaning
- Bottom: 2" MPT threaded connection for proper seating/sealing
- Durable pleated media designed for repeated rinse and deep-clean cycles
- Direct-fit replacement when matched by part number and dimensions
Specifications
- Part Number: 7CH-552
- Outside Diameter: 7"
- Length: 10-1/2"
- Top End Cap: Handle (closed)
- Bottom End Cap: 2" Male Pipe Thread (MPT)
Replaces / Cross References
- Pleatco: PTL55XW-F2M
- Filbur: FC-0465 (some catalogs also list FC-0477)
- Dimension One (OEM reference): 1561-10
Compatibility Notes
- This cartridge uses a 2" threaded bottom. If your current filter has a slip fitting, different thread size, or a different bottom style, you may need a different model.
- Always confirm fit by matching the 7" diameter, 10-1/2" length, and 2" MPT bottom before ordering.
When to Replace
- Pleats are torn, frayed, flattened, or separating from the end caps
- Water stays cloudy or circulation feels weak even after cleaning
- Filter quickly plugs up again after rinsing
- End caps or threaded connection are cracked/warped and won’t seal properly
Related Products
- Unicel 7CH-552 (Shop / Options)
- Spa Cartridge Filter Cleaner
- Cartridge Cleaning Wand
- Spa Pre-Filters (Fill / Hose Filters)
- Spa Water Test Strips
Maintenance Tips
- Rinse the cartridge regularly (often weekly with heavy use) to prevent restriction and keep flow strong.
- Deep clean every 3–6 weeks with a cartridge cleaner to remove oils; rinse thoroughly before reinstalling.
- If scale is present, degrease first, then treat for scale (never reverse the order), and rinse completely.
- Rotate between two cartridges when possible—one in use, one drying after cleaning—to extend overall filter life.
Questions about returns? View our return policy.
Hours Of Operation:
Monday - Friday: 8:00 am to 4:00 pm Phoenix Time
Saturday and Sunday: Closed
- Orders costing more than $300 WILL be required to have signature confirmation upon delivery.
- Handling time is typically only 1 day.
- Any item ordered after 1pm Phoenix time, may not ship same-day.
- Call us if you require expedited shipping and we can give you quotes based on your needs.
Return Policy:
- All products, except as noted below, are eligible for return up to 30 days after receipt of item.
- For returns, an RMA form must be filled out HERE or customers can call for additional help.
- Shipping costs will be deducted from all returned items.
- Any item that is missing accessories, original packaging, or is not returned in the same condition that it was received in, may be subject to a re-stocking fee up to 100% based on the condition we receive it in.
- Items broken, damaged, or inoperable due to installer error will not be refunded.
- Fill out the return form or give us a call to obtain an RMA and return shipping label.
- There are no returns on the Pentair Colorsync 618031
- No returns on pool cleaners.
- No returns on opened seals and o-rings.
- No returns on capacitors.
- If a light is returned because it "doesn't work" and it tests fine, the cost to ship and a re-stocking fee will be deducted from the refund.
- All products denied upon arrival at customers house WILL be charged the cost to ship.
- Visa Gift Card Promotions: Gift cards are sent within 14 days of the order. When accepting the Visa Gift card, you agree that if your order is returned or refunded, this amount will be deducted from the refunded amount. All Visa Gift cards are sent via email in an E-Gift Card format and are non refundable.
Related Products
