Hi, I have a sea land vacu flush head and it uses fresh water to flush I saw on another post that a raw water flush hooked up as a fresh water flush has the potential to contaminate the fresh system. Do I have that to wory about with this unit? Also how does this unit work I know it creates a vacume to pull every thing through but the vacu flush part has its own lil tank and stuff what does it do? Does it run through a macerator on its way through? And can this unit be hooked up to a type 1 msd?

-Andrew
AndrewCaml238332.9935532407

It's safe to connect toilets that are designed to use pressurized flush water to the fresh water system. Your VacuFlush is designed to use pressurized flush water...so it's safe to connect to it the fresh water system.

As for how it works: The Vacuflush is an incredibly simple system that hasn't really changed in 30 years. It consists of 3 components:

The bowl assembly.

The vacuum pump, which has two functions:

1. it pulls all the air out of the system between the bowl and the pump, creating a "vacuum" that when released, sucks the bowl contents out of the bowl and pulls it through the system as far as the pump.

2. At the same time the vacuum pump is pulling the air out of the system, it's also pushing the waste the rest of the way to its destination--tank, overboard, or treatment device.

The vacuum accumulator tank

The vacuum tank just provides the necessary space in the system to create enough volume of "vacuum" needed. It serves no other purpose. The switch that turns the pump on and off is in the vacuum tank...it has a sensor that recognizes when there isn't enough negative pressure (11-13 psi) and turns the pump on...turns it off when there is. An air leak anywhere in the system will cause the pump to cycle or even run continuously between flushes.

When you step on the pedal, the accumulated suction pulls the waste through the vacuum tank to the pump, which pushes it the rest of the way to the tank while it restores "vacuum." It does not macerate.

That's all there is to the Vacuflush toilet. However, SeaLand packages the toilet, holding tank, tank level monitor and any overboard discharge pump to dump the tank as a "system," which just confuses most owners because they have no idea which parts affect the operation of the toilet and and which ones are just add-ons, same as any tank etc in any other system.

Obviously you don't have the owners manual for it, or you wouldn't have to ask how it works. I strongly recommend that you call SeaLand (800-321-9886) to get one...'cuz just about every symptom, probable causes and cures that a VacuFlush can develop is included in the trouble-shooting guide in it.

Yes, it can be connected to a Lectra/San....Raritan even has specific instructions for connecting a Vacuflush to a Lectra/San. However, it cannot be used with a Purasan because the PuraSan is only certified for use with macerating electric toilets.