Unicel Replacement Spa Filter Cartridge 40 sf | 5CH-402
Unicel
SKU: 5CH-402
Unicel 5CH-402 Replacement Spa/Hot Tub Filter Cartridge – 40 sq ft
Part # 5CH-402 — a high-quality replacement filter cartridge for hot tubs and spas, engineered to deliver reliable filtration, clear water, and long service life.
Key Features
- 40 sq ft of premium polyester media for efficient debris capture and water clarity.
- Approximately 204 pleats for high surface area and better filtration performance.
- Compact size — about 5-3/16″ outer diameter and 10-3/4″ length — to fit many spa filter housings.
- Top end cap with bar-handle for easy removal; bottom end cap with 2″ male-thread (MPT) for secure fitment.
- Durable construction that resists pool and spa chemicals, supporting multiple cleanings and extended use.
Typical Applications
Ideal for replacement in spas, hot tubs, and small pool cartridge filter systems that originally used a 40 sq ft cartridge. Use when the old cartridge becomes clogged, loses flow, shows damage, or fails to maintain water clarity.
Installation & Compatibility Notes
Turn off the pump and relieve pressure before servicing. Remove the filter housing lid, lift out the old cartridge, and clean out debris. Insert the new 5CH-402 cartridge ensuring proper seating and alignment. Reassemble the housing, restore circulation and verify normal flow and pressure.
Why Choose This Cartridge?
The 5CH-402 combines compact size, ample filtration surface area, and durable materials to deliver dependable spa filtration. It’s a cost-effective replacement option that helps maintain water quality and extend the life of your spa or hot tub filter system.
Maintenance Tips
- Rinse the cartridge thoroughly every few weeks to remove trapped debris and extend life.
- Deep-clean or replace the cartridge when water flow drops or cleaning cycles shorten significantly.
- Inspect end caps and pleats regularly — replace the cartridge immediately if damaged or deformed.
- Keep a spare cartridge on hand to minimize downtime during maintenance.
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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