Airhead Image AirHead Dry Toilet
At last, a go anywhere essential for comfort.

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Air Head Dry Toilet is uniquely simple. By separating liquids from solids the volume of solid human matter is significantly reduced. Which means that in approximately five gallons, perhaps a seasons worth of weekend use, may be held. This estimate is based on solid matter volume for two persons' use twice every weekend for five months: 80 uses.

Much like a household toilet the Air Head Dry Toilet has a bowl and an actuator which provides a "flush". The main difference due to the toilet's waterless operation is the use of a paper bowl liner which acts as a carrier for the solid matter on its way to the solid tank.

With a combination of agitation and desiccation solid matter is rendered non-offensive inside the large tank. Additionally, the unit has an integral 12 volt fan that provides a constant negative pressure which pulls moisture out of the living space. In many cases a noticeable improvement in air quality will be perceived upon opening the companionway hatch after lay-ups.

Liquids are collected in the smaller forward tank. Our unit's liquid tank makes an otherwise unpleasant chore very easy a with convenient carrying grip so that you don't have to become intimate with the contents, and its wide mouthed aperture will keep the contents emptying smoothly into any standard commode. The liquid tank will hold approximately four days use per person if used exclusively.

Additionally, the Air Head Dry Toilet may be integrated with an existing holding tank system creating holding capacity for both solids and liquids far beyond what many medium and small boat owners are used to. This is because the tanks take on no flushing water and are free to hold just what they need to.

Frequently Asked Questions

Q: Is this product legal?
A: Yes, Air Head Dry Toilet is classified as a MSD type III.

Q: What happens to the odors in the solid tank?
A: Once solid matter enters the main tank the foul-smelling anaerobic bacteria dies in a few days in the presence of air making way for non odorous aerobic bacteria. This process works best when urine is not present, (as inside the Air Head Dry Toilet), due to a carbon/nitrogen ratio that maximizes aerobic bacterial action.

Q: Has this design been tested?
A: Yes. Air Head Dry Toilet units have been tested in cruising vessels and used in liveaboard cruising conditions. Several units have been placed in home environments resulting in approximately six years of cumulative testing. Additionally, the basic "urine diversion" design dates back to ancient far east and is still used in underdeveloped countries around the world and advocated by world social and health and organizations as a sanitary means of waste treatment.

Q: Where do you empty the solids?
A: It depends on usage.

At Sea:
When offshore and or outside of the legal limits of United States, the solids may be taken to the edge of the boat and dumped overboard. Dumping naturally produced matter in US inland lakes and coastal areas is illegal and environmentally unsound due to the potential for high concentrations of waste in these areas. High concentrations of waste results in elevated algae growth, and death of oxygen breathing aquatic species. Hygiene is an issue as well. This is not the case when out to sea. The Air Head Dry Toilet allows cruisers the opportunity to fill up on anchor and dump on passages, thereby eliminating the need to dirty the beautiful, clear tropical waters they worked so hard to sail to. The solid tank should hold about a month of every day uses for a couple.

On Land:

Following the instructions provided with the unit on this topic, the solid tank contents may buried in ornamentals or sprinkled on top depending on conditions. A once a season emptying scenario is possible where a family of two consistently uses the Air Head Dry Toilet for five months twice each weekend totaling 80 uses or less. This amount of usage allows tank contents sufficient time to dry or break down. After a seasons worth of boating the contents of the solid tank will be dry as a desert or slightly moist. In relative terms of course, the state of these contents will be surprisingly pleasant, having only a slight musty smell. This is assuming the tank is emptied the following spring or a few weeks after the last use. So the best scenario is to empty the following spring during commissioning.

Q: Can the fan be turned off for periods when for instance the boat will be on a mooring?:
A: We do not recommend the unit remain installed with the fan disconnected. Moisture and a musty smell will be noticed inside the cabin when the fan is not running for any long period of time. We recommend the use of a small solar panel to offset the drain on the batteries.

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Last updated: December 2006 copyright 2006, EOS Design LLC, All rights reserved.