Unicel Replacement Filter Cartridge 30 sf | 4CH-30
Unicel
SKU: 4CH-30
Unicel 4CH-30 Replacement Spa Filter Cartridge – 30 Sq Ft (4-5/8" OD x 11-7/8" Length, 1-1/2" MPT Bottom)
The Unicel 4CH-30 is a top-load spa filter cartridge designed for select hot tubs and spa filter canisters that use a 1-1/2" male pipe thread (MPT) screw-in bottom connection and a molded cone handle on top for easy removal. With 30 sq ft of pleated filtration area, it helps capture fine debris for clearer water and more consistent circulation when rinsed and cleaned regularly.
Key Features
- 30 sq ft pleated filtration area for effective debris capture
- Top: molded cone handle (closed top) for quick removal
- Bottom: 1-1/2" MPT threaded connection for a secure, screw-in fit
- Durable pleated media and rigid core built for repeated cleaning cycles
- Ideal replacement when pleats are torn, flattened, or the cartridge stays restrictive after cleaning
Specifications
- Part Number: 4CH-30
- Filtration Area: 30 sq ft
- Outside Diameter: 4-5/8" (4.625")
- Length: 11-7/8" (11.875")
- Top End Cap: Molded cone handle (closed)
- Bottom End Cap: 1-1/2" male thread (MPT)
- Pleat Count: 158
Replaces / Cross References
- Filbur: FC-0141 / FC-0141M
- Pleatco: PTL25P4
- Sundance Spas: 6540-484
- Dimension One: 1561-14
- Saratoga Spas: 74407-98
- Darlly: 40301
- Baleen: AK-9005
Compatibility Notes
- This cartridge uses a threaded bottom (1-1/2" MPT). If your current filter has a slip (non-threaded) fitting or a different thread size, you need a different cartridge.
- Always confirm fit by matching the OD, length, and bottom connection style to your existing filter.
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
- The cartridge quickly plugs up again after rinsing
- End caps or threaded connection are cracked/warped and won’t seal properly
Related Products
- Spa Cartridge Filter Cleaner
- Cartridge Cleaning Wand
- Spa Water Test Strips
- Spa Fill / Hose Pre-Filters
- Spa Scale Remover
- Silicone O-Ring Lubricant (Pool/Spa)
Maintenance Tips
- Rinse the cartridge regularly (often weekly with heavy spa 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.
- Let the cartridge dry after deep cleaning when possible—drying can help loosen fine debris for easier rinsing.
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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