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: 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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