These in-line vent filters use specialized activated carbon to scrub and neutralize harmful gases (primarily hydrogen sulfide) and sewer smells from boat holding tanks.

A newly designed product with Carbon Helix. This new innovation has greatly increased odor removal efficiency and longevity. Engineered and tested by boating experts in the Pacific Northwest. When other Holding tank vent filters fail in just a couple of months, the Nautilus Filter sets out to design a completely new solution that not only 100% eliminated holding tank odors but would last well into a second boating season. There is the ability to easily refill this filter with proprietary activated carbon blend saving the significant replacement cost and eliminating the plastic waste that comes with purchasing a whole new unit each season.