Unicel Replacement Filter Cartridge 30 sf Watkins | C-6430
Unicel
SKU: C-6430
Unicel C-6430 30 sq ft Replacement Cartridge Filter
The Unicel C-6430 is a premium 30 square-foot cartridge filter designed for spas and small-to-mid-size pool systems. It delivers reliable filtration, high dirt-holding capacity, and straightforward installation for hot tubs and compatible filter housings.
Key Features
- 30 sq ft filtration area — provides ample surface for efficient debris and particulate capture while maintaining good flow rates.
- 124 pleats for increased surface area and better dirt trapping compared to standard flat filters.
- 6″ outer diameter and 10.5″ length — compact size suitable for many spa and small-pool filter housings.
- Open-top and open-bottom 1 15/16″ inner diameter ports for easy installation and wet-end flow compatibility.
- Durable polyester media and chemical-resistant end caps — built to withstand repeated cleaning and spa/pool water conditions.
- Direct replacement for many OEM cartridges (e.g. for select Hot Springs / Watkins spas and systems using equivalents like Filbur FC-3915 or Pleatco PWK30).
Specifications
- Manufacturer: Unicel
- Part Number: C-6430
- Filter Type: Cartridge filter
- Filtration Area: 30 sq ft
- Outer Diameter: 6″
- Length: 10.5″
- Top & Bottom Port Inner Diameter: 1-15/16″ (open-end)
- Pleat Count: 124
- Media: Durable polyester filter cloth
- Application: Compatible spas, small pools, and filter housings originally using C-6430 or equivalent cartridges
Why Choose C-6430
Whether you’re replacing a worn cartridge or upgrading your spa’s filtration, the C-6430 offers a balance of strong flow and thorough filtration in a compact design. Its large pleated surface area extends filter cycles and helps maintain cleaner, clearer water — ideal for spas or small pools needing dependable, low-maintenance filtration performance.
Installation & Maintenance Tips
- Shut off the pump and relieve pressure before removing the old cartridge.
- Ensure the filter housing is clean before installing the new C-6430 cartridge — debris or buildup can reduce performance.
- Check that both top and bottom ports seat properly to ensure tight, leak-free flow.
- Rinse or soak the cartridge regularly (per spa/pool manufacturer recommendations) to extend service life, and replace when pleats become damaged, warped, or hardened.
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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