RVing in Central America

they work but they do double the amount of waste

Not sure what this means?

We use water to force the waste down the hose? Is that waste? If we use something like what most RVers use - what we refer to as the "stinky slinky" we either put it back filthy as a breeding ground for disease or we try to rinse it clean and sanitary which is impossible to do with almost any amount of water. The Sewer Solution is certainly not totally sanitary but it is a great deal cleaner than the slinky - no matter how much rinsing you do. So you either use some water or you put filth in your living quarters. We find the SS does not use as much water as you might think and we almost always pump from our fresh water tank when in Mexico. With a little creativity it is not that much of a problem to store lengths of PVC on/in any rig - we would never buy 100' of hose when PVC is always available anywhere - and you can cut it to length to fit anywhere - 1" of pipe can be tied to the side or roof if space is really that tight.

I have tried to find a simple explanation of Venturi jet propulsion and it is to complicated for me. Simply put - if you have a 1/2" pipe at 15psi feeding a 1/8" jet you get increased velocity. The SS uses this principle so as the water jets through the orifice it increases speed and the waste dropping down from the black tank is drawn down at increasing speed and forced down the 3/4" drain hose. The amount of water going through the 1/8" jet is greatly reduced and once the waste is completely evacuated the jet sends clean water down the smooth surface 3/4" hose to rinse it clean - a tiny bit of Clorox added will sanitize the entire hose. We all have different opinions of what "clean" means.

Since the macerator and other methods of sewage removal were brought up I threw in the SS. Back in the old days we pooped in a plastic bag and put it in a garbage can - just as we do with our dog poop these days. If you really want to KISS you can find a bush.