Unicel Replacement Filter Cartridge for 34 sf Marquis Spa | C-5423
Unicel
SKU: C-5423
Unicel C-5423 Filter Cartridge
Part Number: C-5423
Description
This filter cartridge offers 34 sq ft of surface area and is designed for use in specific hot tub and spa systems that require a 5.187″ diameter by ~11.9″ length cartridge with closed top and 1.625″ open bottom. It’s constructed of high quality pleated media to capture debris and maintain water clarity.
Compatibility & Fitment
- Fits spa filter applications requiring the former OEM part 20045 or 370-0215 for brands such as Marquis Spas. :contentReference[oaicite:0]{index=0}
- Dimensions: approx. 5 3/16″ outside diameter × 11 15/16″ length; top end cap closed; bottom inner diameter ~1 5/8″. :contentReference[oaicite:1]{index=1}
- Media area: approximately 34 sq ft. :contentReference[oaicite:2]{index=2}
Features & Specifications
- 34 sq ft of filtration area to provide enhanced debris capture compared to smaller cartridges. :contentReference[oaicite:3]{index=3}
- Pleat count of about 158 for increased surface area and better flow. :contentReference[oaicite:4]{index=4}
- Durable pleated media with closed top cap and open bottom design for proper flow alignment in compatible filter housings.
Installation Notes
Turn off power and isolate circulation before removing the old cartridge. Remove the filter housing cover, extract the old cartridge, clean inside the housing of debris, inspect O-rings for wear, and insert the C-5423 ensuring correct orientation (closed top up, open bottom down). Re-assemble, pressurize the system, and check for normal pressure rise and flow.
Maintenance Tip
Clean the cartridge periodically (for example every 4–6 weeks) using a filter wash solution, then rinse thoroughly. Replace the cartridge when cleaning no longer restores proper pressure drop or flow is degraded. A high-quality cartridge like the C-5423 can help maintain optimal water clarity and reduce chemical usage over its service life.
SKU: C-5423
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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