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: 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.
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