Unicel Replacement Filter Cartridge 25 Sf, 7" L | 6CH-26
Unicel
SKU: 6CH-26
Unicel 6CH-26 Replacement Spa Filter Cartridge – 25 Sq Ft (6" OD, Handle Top, 1-1/2" Threaded Bottom)
The Unicel 6CH-26 is a 25 sq ft pleated replacement filter cartridge used in select hot tub and spa filtration systems that require a compact top-load cartridge with a semi-circular handle and a 1-1/2" threaded bottom connection. Replacing a worn cartridge helps restore circulation, improves water clarity, and reduces strain on spa pumps and heaters.
Key Features
- 25 sq ft filtration area for dependable debris capture
- Top: semi-circular handle for easy removal
- Bottom: 1-1/2" male threaded connection (commonly listed as MPT / SAE coarse thread depending on catalog)
- Durable pleated media designed for repeated rinsing and deep-clean cycles
- Direct replacement when matched by part number and dimensions
Specifications
- Part Number: 6CH-26
- Filtration Area: 25 sq ft
- Outside Diameter: 6"
- Length: 7" (some catalogs list approximately 7-1/8")
- Top End Cap: Closed with handle
- Bottom End Cap: 1-1/2" male threaded
Replaces / Cross References (Verify Fit)
- Filbur: FC-0310
- Pleatco: PAT25P4 (also commonly referenced: PTL25W-SV-P-4)
- Other common references: 12521, AK-9012
Compatibility Notes
- Many spa cartridges look similar—confirm the 6" OD, ~7" length, handle top, and 1-1/2" threaded bottom before ordering.
- If your current filter has a slip fitting (non-threaded) bottom, a different thread size, or a different top style, you likely need another model.
When to Replace
- Flow is weak or the system struggles to maintain circulation even after cleaning
- Pleats are torn, frayed, flattened, or separating from the end caps
- Filter quickly plugs again after rinsing
- End caps or threaded connection are cracked/warped and won’t seal properly
Related Products
- Unicel 6CH-26 (Shop / Options)
- Spa Cartridge Filter Cleaner
- Cartridge Cleaning Wand
- Spa Water Test Strips
- Spa Scale Remover
- Spa Fill / Hose Pre-Filters
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 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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