Unicel Replacement Filter Cartridge 25 sf | 4CH-24
Unicel
SKU: 4CH-24
Unicel 4CH-24 Spa/Pool Filter Cartridge (25 sq ft)
The Unicel 4CH-24 is a high-quality replacement filter cartridge commonly used in spas and small pool filtration systems. It offers reliable filtration performance, helping keep water clear by capturing debris, oils, and fine particles.
Key Features
- 25 sq ft of pleated filter media — enough surface area for effective filtration on smaller pools or spas.
- 173 pleats with spun-bonded polyester media — enhances dirt-holding capacity and maintains strong flow.
- Compact size (about 9.75″ long × 4.625″ outer diameter) — fits many common spa and small pool filter housings.
- Top-load design with molded cone handle — makes cartridge removal and replacement quick and easy.
- Bottom end cap with 1.5″ MPT threaded outlet — works with standard spa/pool plumbing configurations.
- Chemical-resistant and designed for repeated cleaning cycles without degradation of media.
Specifications
- Manufacturer: Unicel
- Part Number: 4CH-24
- Filtration Area: 25 sq ft
- Pleat Count: 173
- Outer Diameter: ~4.625″
- Length: ~9.75″
- Top Cap: Molded cone handle (top-load style)
- Bottom Cap: 1.5″ male-thread (MPT) outlet
- Media: Spun-bonded polyester filter media
- Typical Use: Spa and small pool cartridge filters, hot tubs, compact filtration systems
When to Replace / Use
Use the 4CH-24 when the existing cartridge is clogged, pleats are compressed or damaged, or filtration performance declines (e.g., reduced flow, cloudy water, more frequent cleanings). It’s also ideal as a spare cartridge for regular maintenance cycles on spas or smaller pools.
Maintenance & Care Tips
- Rinse the cartridge regularly (every 2–4 weeks depending on use) to remove trapped debris and prolong media life.
- Periodically soak or deep-clean the cartridge with a spa-safe filter cleaner to remove oils, lotions, and organic buildup that normal rinsing cannot remove.
- Inspect pleats and end caps for tears, media collapse, or chemical wear — replace if any damage is observed.
- Keep a spare cartridge on hand — rotating filters allows one to dry between uses and extend overall cartridge life.
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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