Unicel Replacement Filter Cartridge 8.5 sf Rainbow Chloro | C-2303
Unicel
SKU: C-2303
Unicel C-2303 Replacement Cartridge Filter (8.5 sq ft)
Part # C-2303 — a high-quality replacement cartridge from Unicel designed for spa and small pool filtration systems. This compact filter element provides approximately 8.5 square feet of pleated filtration media to maintain clean, clear water in low-volume systems.
Key Features
- Approximate dimensions: 17 1/16″ length × 2 7/8″ outer diameter.
- Both ends open with an inner diameter of approximately 2 1/8″ for easy drop-in installation.
- Provides about 8.5 sq ft of filtration area with 150 pleats for efficient debris capture.
- Durable polyester filtration media engineered for long-term chemical and pressure resistance.
- Direct replacement for several OEM cartridges used in compact spa and hot-tub filtration systems.
Typical Applications
This cartridge is ideal for spas, hot tubs, and small pool systems that use a compact cartridge filter element. It is typically replaced when pressure increases, water clarity drops, or pleats show signs of wear or deformation.
Installation & Compatibility Notes
Turn off the pump and relieve system pressure before opening the filter housing. Remove the old cartridge and clean any debris from inside the tank. Insert the new Unicel C-2303 cartridge, ensuring correct seating and alignment on the filter manifold. Reassemble the housing and verify proper flow and pressure once the system is restarted.
Why Choose This Cartridge?
The Unicel C-2303 offers dependable performance in a compact size, making it suitable for tight equipment spaces. Its strong pleat structure and quality filtration media help extend service intervals and maintain consistently clear water.
Maintenance Tips
- Rinse the cartridge every 4–6 weeks or when system pressure rises noticeably above the clean starting level.
- Use a gentle hose spray to clean between pleats; avoid high-pressure sprayers that may damage the media.
- Perform an annual deep-clean soak using a cartridge cleaner to remove oils and fine debris.
- Inspect for cracked end caps, torn pleats, or softened media; replace the cartridge if any damage is observed.
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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