Unicel Replacement Filter Cartridge 35 sf, 8" L | 5CH-35
Unicel
SKU: 5CH-35
Unicel 5CH-35 Spa Filter Cartridge – 35 Sq Ft (5-5/8" OD x 8" Length, Handle Top, 1-1/2" MPT Bottom)
The Unicel 5CH-35 is a replacement 35 sq ft pleated spa filter cartridge designed for select hot tub and spa filtration systems that use a compact cartridge with a semi-circular handle on top and a 1-1/2" male pipe thread (MPT) connection on the bottom. Replacing a worn cartridge helps restore circulation, improve water clarity, and reduce strain on spa pumps and heaters.
Key Features
- 35 sq ft filtration area for effective debris capture and steady spa flow
- Top: semi-circular handle for easy removal
- Bottom: 1-1/2" MPT threaded connection for secure fit in compatible canisters
- 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: 5CH-35
- Filtration Area: 35 sq ft
- Outside Diameter: 5-5/8" (5.625")
- Length: 8" (end cap to end cap)
- Top End Cap: Closed with semi-circular handle
- Bottom End Cap: 1-1/2" male thread (MPT)
- Pleat Count: 203
- Media: 3 oz pleated media
Replaces / Cross References
- Pleatco: PAS35P4
- Pleatco (alternate reference): PMAX50P4
- Filbur: FC-0300
- Darlly: 50353
Compatibility Notes
- This cartridge uses a threaded bottom (1-1/2" MPT). If your current filter has a slip fitting (non-threaded) bottom, you need a different model.
- Always confirm fit by matching the 5-5/8" OD, 8" length, handle top, and 1-1/2" MPT bottom connection.
When to Replace
- Flow is weak or the spa struggles to maintain circulation even after cleaning
- Pleats are torn, frayed, flattened, or separating from 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
- Unicel 5CH-35 (Shop / Options)
- Spa Cartridge Filter Cleaner
- Cartridge Cleaning Wand
- Spa Fill / Hose Pre-Filters
- Spa Water Test Strips
- Silicone O-Ring Lubricant (Pool/Spa)
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 overall filter life and improve filtration consistency.
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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