Originally Posted by WyoFree
how it works and why its a good thing for an RV?
Can you help?
A conventional RV toilet is installed directly above the black tank. In the base of the toilet bowl is a gate valve. Typically, users keep a little water in the toilet bowl to help seal the gate valve since it's the only barrier between the bathroom and the black tank. After waste is deposited into the toilet bowl, the gate valve is briefly opened allowing the waste to drop straight down into the tank. Some people complain that during that brief opening,it's possible for some "aroma" to escape the black tank into the bathroom. Many folks use various types of tank deodorizers to mitigate that problem.
A macerator toilet bowl has a design similar to a standard home style toilet, sort of a modified p trap drain. The bowl remains filled with water at (almost) all times. When waste is deposited into the toilet bowl, using an electrically powered push button, a macerator pump mounted integral to the bottom rear of the toilet is activated. That macerator pump chops any waste and propels it through the waste system piping into the black tank. Concurrent with that macerator pump activation, a water shutoff valve opens and allows a stream of fresh water to refill the now empty toilet bowl. That whole process takes about 5 seconds.
Conventional toilet benefits: simple, not many moving parts, doesn't require very much water.
Conventional toilet disadvantages: possible to experience unpleasant aromas; possible to construct the infamous "brown tower" immediately below the toilet in the black tank.
Mascerator toilet benefits: no aromas into the bathroom, since the waste has all been "pureed" and suspended in more water, it's possible to install the toilet some distance from the black tank, to the best of my knowledge, all macerator toilets have porcelain bowls.
Macerator toilet disadvantages: it does make some noise during operation, it does use more water (there IS a user adjustment to the amount of water, but, it will ALWAYS be more than a conventional toilet), significantly more complex (expensive), requires 12v. dc power to operate.
All that being said, I have one installed in my motorhome. 5 years of trouble free operation, living an average of 5 months a year in the motorhome. I don't dry camp, so the water use isn't much of a concern for me.
We like it.