An NSF-certified solid blue filter housing built for slim 10″ × 2.5″ cartridges with 3/4″ ports — the direct replacement for the blue housings on MyWaterClub dual- and triple-stage systems. Blocks light for maximum media protection.

What it does

Filter housings do get old — even opaque polypropylene will eventually take a nick on the O-ring seat, develop stress cracks around the threads, or crack the sump if it’s been over-tightened or if it ever froze. This is the drop-in replacement for the blue housing on any slim 3/4″-port whole-house system: pull the old one off, thread the new one on, drop your cartridge in, done.

The solid blue polypropylene body blocks all incoming light — which matters more than it sounds. Zero light means no algae growth potential in the sump, and no UV degradation of the cartridge media. Fits standard 10″ × 2.5″ cartridges (also labeled 9 7/8″ × 2.5″ on some brands) and threads onto any system with 3/4″ NPT ports.

Interchangeable with semi-clear blue housings of the same size — so you can freely mix or swap between the two on a multi-stage system.

Key benefits

• ✓NSF certified for use in drinking-water systems
• ✓Fits any standard 10″ × 2.5″ slim cartridge (9 7/8″ equivalent)
• ✓3/4″ NPT inlet & outlet ports — standard whole-house install
• ✓Solid blue polypropylene — blocks light, prevents algae growth in the sump
• ✓Interchangeable with semi-clear blue housings of the same size
• ✓Food-grade materials — safe for potable water
• ✓Typical service life 3–4 years under normal residential use
• ✓Direct replacement for the housings on MyWaterClub dual- and triple-stage systems

Specifications

Compatibility

Often used with

Good to know before you buy

• Do NOT install where temperatures can drop below freezing. Water expands as it freezes and will crack the housing — garages and outbuildings in cold climates need heat tape or an indoor location.
• Blue housings block algae-causing light — but for the longest housing life, still install out of direct sunlight since UV eventually fades and embrittles even blue polypropylene over years.
• Cold water only — maximum working temperature is 100℉. Not for hot-water lines.
• Hand-tighten the sump snugly, then a quarter turn with the housing wrench — over-tightening cracks the plastic and defeats the O-ring seal.
• Lightly lubricate the O-ring with food-grade silicone grease at every filter change — keeps it supple and prevents rolling on reassembly.
• Use proper thread sealant (PTFE tape) on the port threads during installation.
• Plan to replace the whole housing every 3–4 years, or sooner if you see cracking, stress marks around the threads, or weeping around the seal.