The Nautilus Filter® uses a proprietary blend of Specialized Activated Carbons specifically targeting gasses (mostly H2S) and odors produced in a holding tank.
Through extensive testing, these Specialized Activated Carbons were chosen and blended together. The Nautilus Filter® has the best odor removal efficiency and longest lasting performance available. Includes custom refill funnel.

Carbon Refill Kit Includes

- Vacuum sealed Nautilus Filter® Carbon Blend of Activated Carbon (indefinite shelf life)

- Custom Refill Funnel

• Refill instruction Video - https://nautilusfilter.com/pages/holding-tank-vent-filter-refill