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: 7:00 am to 5:00 pm Phoenix Time
Saturday: 8:00 am to 2:00 pm
Sunday: Closed
- We do not ship on Saturday or Sunday.
- Orders totaling more than $300 will require signature confirmation upon delivery.
- We process and prepare orders for shipment within 1 business day. Please note that many other pool supply retailers require 3–5 days of handling time before shipping.
- Orders placed after 1:00 pm Phoenix Time may not be eligible for same-day shipment.
- Expedited shipping options are available at checkout.
Return Policy:
- Products that are received damaged will receive a refund in store credit.
- Most products are eligible for return within 30 days of receipt, except where noted below.
- To initiate a return, please complete an RMA form prior to sending your item back.
- Original shipping costs are non-refundable and will be deducted from the return credit.
- Items returned missing accessories or original packaging, or that are not in the same condition as received, may be subject to a restocking fee of up to 100% depending on the condition of the item upon return.
- Some returns will be charged an automatic 15% restocking fee.
- We are unable to issue refunds for items that have been damaged or rendered inoperable due to installer error.
- Please complete the return form to receive your RMA number and return shipping label.
- Chemical products are not eligible for return under any circumstances.
- The Pentair Colorsync 618031 is not eligible for return.
- Pool cleaners are not eligible for return.
- Opened seals and o-rings are not eligible for return.
- Capacitors are not eligible for return.
- Plastic popup tools are not eligible for return.
- Automation components and circuit boards are not eligible for return.
- If a light is returned due to a reported malfunction and is found to be fully operational upon testing, return shipping costs and a restocking fee will be deducted from the refund.
- Orders refused at the time of delivery will be subject to the original shipping costs being deducted from the refund.
Related Products
