mlts22 wrote:
I looked at a cassette toilet for a Sportsmobile build, as well as a Nature's Head composting toilet.
The good about a cassette toilet:
- Self-contained, so it can be used even when the vehicle is winterized.
- Can be wheeled into any toilet stall and dumped.
- One can carry 2-3 with some ease.
The bad:
- Can be heavy, and if one has back issues, slinging this around may not be good.
- There are few US RV parks equipped to handle dumping of these. You can always try emptying it out through the sewage plug, but that can be iffish... and possibly messy.
- It takes more time to dump than a black tank.
My thought is as follows:
If I were boondocking 100% of the time with weeks to months without going back to civilization, I'd buy a Nature's Head composting toilet. The liquid gets collected in a bottle, solids are composted (although you do need to carry bags of peat as a starter, and emptying the composter can be messy.) Because this produces the least amount of waste, it would be useful for when there is no place to dump. Of course, the ideal would be what Dometic used to sell with motorhomes... they used an exhaust-based incinerator to burn the contents of the black tank into sterile ash, but that isn't sold anymore.
If I were boondocking for weeks at a time with a van or truck camper, I'd consider a cassette toilet and 3-4 cassettes. They can remain outside until time to hit the road, then put in a plastic tub and placed inside. At a national or state park, I can wheel them to the bath-house and dump them down the toilet (with permission, of course.)
However, for what I do (boondocking for days at a time), a conventional black/gray system is good enough and with a macerator pump, can be versatile.
As someone who actually has used a cassette toilet,
The bad,
1) agree that a full 5 gallon cassette weighs 40 lbs(+ -) and maybe heavy to carry a long way. I don't find it a problem at all.
2) Directing the 2" drain pipe into a 4" sewer pipe is much easier than filling up your vehicle with gas from a Gerry can.
3) You can empty a 5 gallon cassette in under 7 seconds after releasing the air lock button. I said in an earlier post that it took 2 minutes start to finish. It is probably closer to 1 minute.
Dave