Doule King hot tub filter 6CH-940 fit improves water clarity and circulation.
Doule King hot tub filter PWW50-compatible for easy spa maintenance.
Doule King hot tub filter Filbur FC-0359-compatible ensures reliable filtration.
Doule King thicker trilobal fabric enhances contaminant capture and cartridge life.
Doule King center core design boosts strength during spa cycles.

Doule King

Doule King Hot Tub Filter for Unicel 6CH-940, PWW50 & Filbur FC-0359 - 1 Pack

High-performance patio lawn and garden made for confident daily results

$24.91

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Why customers choose Cera Garden

Overview

Meet the Doule King hot tub filter, a versatile replacement designed to fit popular cartridge models from Unicel, PWW, and Filbur. It supports steady water flow and reliable filtration without requiring a full system change. This unit is compatible with Unicel 6CH-940, PWW50P3 (not PWW50P4), and Filbur FC-0359 assemblies, making it a flexible option for various spa setups.

With a filtration area of 45 square feet, this cartridge covers a wide surface where contaminants are captured as water passes through. The cartridge features a compact core length and a larger overall length to suit your spa’s housing. The bottom SAE thread and opening dimensions are designed to fit standard hot tub housings, helping ensure a snug, secure seal during operation.

Why choose this filter

  • Filtration area: 45 sq ft for efficient water cleaning
  • Dimensions: 8-1/16" inner length; total 9-1/8"; 5-15/16" diameter; 1-7/16" opening; bottom SAE 1-1/2"
  • Compatibility: Unicel 6CH-940, PWW50P3 (not PWW50P4), Filbur FC-0359
  • Included: 1 filter

Durability and filtration performance

  • Thickened advanced trilobal fabric helps capture more contaminants
  • End caps resist cracking and breakage under spa operating pressure
  • Enhanced center core supports the cartridge for longer service life

In daily use, spa owners appreciate how this filter maintains steady flow and clear water during regular soak sessions and after gatherings. It’s designed to be inspected and rinsed between replacements, then swapped out when performance declines.

What you get and installation tips

  • Included: 1 filter
  • Tip: Check model numbers and thread size before installing to ensure a proper fit
  • Tip: Rinse the cartridge under cool water before first use, and after heavy use to remove debris

Note: Always verify your filter model and housing to confirm compatibility. This Doule King filter is offered as a flexible option to help keep spa water clean without changing the whole filtration system.

FAQ

Q: Is this filter compatible with Unicel 6CH-940 and PWW50?

A: Yes, it fits Unicel 6CH-940 and PWW50P3 (not PWW50P4), plus Filbur FC-0359 variants; verify your model and thread size.

Q: What are the standout features of this filter?

A: Key features include thick trilobal fabric, durable end caps, and a reinforced center core for longer service life.

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