Unicel Replacement Filter Cartridge for 50 sf Marquis Spa | C-5346
Unicel
SKU: C-5346
Unicel C-5346 Replacement Spa Filter Cartridge – 50 Sq Ft (Marquis “Old Style”)
The Unicel C-5346 is a high-performance 50 sq ft pleated spa filter cartridge commonly used in select Marquis Spas applications that take the “old style” 50 sq ft element. It features a closed top with a string handle for easy removal and a 1-5/8" open bottom to fit the matching standpipe/canister connection.
Key Features
- 50 sq ft filtration area for clear water and steady circulation
- Closed top with string handle for quick removal during cleaning
- Bottom: open 1-5/8" inside diameter for proper fit on compatible housings
- Durable pleated media designed for repeated rinse and deep-clean cycles
Specifications
- Part Number: C-5346
- Filtration Area: 50 sq ft
- Outside Diameter: 5-3/16"
- Length: 14-1/8"
- Top End Cap: Closed (string handle)
- Bottom End Cap: Open
- Bottom Inside Diameter: 1-5/8"
- Pleat Count: 180
- Filter Media: 3 oz pleated media
Replaces / Cross References
- Pleatco: PPM50TC
- Filbur: FC-3638
- Darlly: 50502
- Baleen: AK-4005
- Common OEM References: 20044, 370-0236
Compatibility Notes
- Commonly used in select Marquis Spas that use an “old style” 50 sq ft cartridge.
- Confirm fit by matching the 5-3/16" OD, 14-1/8" length, closed top w/ string handle, and 1-5/8" open bottom before ordering.
Related Products
- Spa Cartridge Filter Cleaner
- Cartridge Cleaning Wands
- Spa Water Test Strips
- Spa Pre-Filters / Skimmer Socks
- Spa Scale Remover
- Silicone O-Ring Lubricant (Pool/Spa)
Maintenance Tips
- Rinse the cartridge regularly (often weekly with heavy spa use) to prevent flow restriction and cloudy water.
- Deep clean every 3–6 weeks using a cartridge cleaner to remove oils; rinse thoroughly before reinstalling.
- If you have calcium scale, degrease first, then treat for scale (never reverse the order), and rinse completely.
- Rotate between two cartridges when possible—one in use, one drying after cleaning—to extend overall filter 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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