Unicel Replacement Filter Cartridge 75 sf Dimension One Spas | 7CH-975
Unicel
SKU: 7CH-975
Unicel 7CH-975 Replacement Spa Filter Cartridge – 7" OD x 10-1/2" Length, 1-1/2" SAE Threaded Bottom (Dimension One Style)
The Unicel 7CH-975 is a replacement spa filter cartridge commonly used in Dimension One and similar hot tub filtration systems that require a 7" diameter cartridge with a semi-circular top handle and a 1-1/2" SAE threaded bottom connection. Replacing a worn cartridge helps restore circulation, improve water clarity, and reduce strain on spa pumps and heaters.
Key Features
- Threaded bottom connection: 1-1/2" SAE (coarse thread) for secure fit in compatible filter canisters
- Top handle: semi-circular handle for easy removal and servicing
- Durable pleated media designed for repeated rinsing and deep-clean cycles
- Helps capture fine debris for clearer water and more consistent flow
Specifications
- Part Number: 7CH-975
- Outside Diameter: 7"
- Length: 10-1/2" (end cap to end cap; excludes handle/threads beyond end caps where applicable)
- Top End Cap: Semi-circular handle
- Bottom End Cap: 1-1/2" SAE thread (coarse)
- Pleat Count (approx.): 216
- Filtration Area: commonly listed around 52 sq ft (some spa catalogs group this size as a “75 sq ft” class; match by measurements and end style)
Replaces / Cross References
- Dimension One: 1561-12
- Pleatco: PDO75P3
- Filbur: FC-0475
- Other common references: 17527, 70522
When to Replace
- Water stays cloudy or circulation feels weak even after cleaning
- Pleats are torn, frayed, flattened, or separating from the end caps
- Filter is difficult to rinse clean or quickly plugs up after cleaning
- End caps or threaded connection are cracked/warped and won’t seal properly
Installation Notes
- Turn off power to the spa before removing the filter.
- Thread the cartridge in by hand until it seats; do not overtighten.
- If your system uses an O-ring or sealing gasket at the housing, inspect and replace if flattened or cracked.
Related Products
- Unicel 7CH-975 (Shop / Options)
- Filbur FC-0475 (Alternate)
- Pleatco PDO75P3 (Alternate)
- Spa Cartridge Filter Cleaner
- Cartridge Cleaning Wand
- 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.
- Rotating between two cartridges (one in use, one drying after cleaning) can extend filter life and improve overall performance.
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.
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