TruDesign Holding Tank Carbon Filter – Marine Vent Odour Filter (19/25mm)

Eliminate unpleasant holding tank odours with the TruDesign Holding Tank Carbon Filter—a highly effective activated carbon vent filter designed to keep your boat fresh and comfortable.

Installed inline on your holding tank vent hose, this filter uses activated carbon media to absorb and neutralise odours produced by decomposing waste, preventing them from venting outside the boat or back into living spaces.

Designed for real-world marine use, it helps manage the common “rotten egg” smell caused by hydrogen sulphide (H₂S), significantly improving onboard comfort—especially on enclosed or family boats.

The unit features a dual hose tail design (19mm & 25mm) for easy integration into existing vent systems, along with a transparent base that allows you to visually check for liquid intrusion—helping prevent damage and maintain performance.

Installation is simple, with options for bulkhead mounting or saddle clips, and it should be mounted vertically (or minimum 45° angle) to ensure proper airflow through the carbon media.

For best results, the carbon cartridge should be replaced annually, ensuring continued odour control and system performance.

Key Features

• Activated carbon filtration – absorbs and neutralises tank odours
• Prevents “rotten egg” smells (H₂S) – improves onboard comfort
• Dual hose tail (19mm & 25mm) – fits common vent hose sizes
• Clear inspection base – check for liquid contamination
• Inline vent installation – easy retrofit into existing systems
• Bulkhead or saddle mounting options – flexible install
• Replaceable carbon media – maintain peak performance annually

Specifications

• Brand: TruDesign
• Product Type: Holding tank carbon filter / vent filter
• Model: 90355
• Hose Sizes: 19mm & 25mm (dual tail)
• Installation: Inline on vent hose
• Mounting: Vertical (recommended) or minimum 45° angle
• Function: Odour absorption via activated carbon
• Maintenance: Replace carbon annually
• Use: Marine holding tanks, RVs, off-grid sanitation systems

Ideal Applications

• Marine toilet holding tanks
• Grey water and waste systems
• Caravan and RV sanitation systems
• Boats with enclosed cabins or limited ventilation

This filter is essential for eliminating odours at the source, improving onboard air quality without affecting tank ventilation.

Why Buy from Barton Marine NZ?

• Trusted NZ supplier of marine sanitation systems
• Fast nationwide delivery
• Genuine TruDesign NZ-made products
• Proven solution for NZ boating conditions

Pro Tip  

For best performance:

• Install as high as possible in the vent line
• Ensure no liquid can enter the filter (use loops if needed)
• Pair with a TruDesign tank monitoring system for complete setup