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.