Replacing black water tank with freshwater tank.

[Clamrobot]

I am a new RV owner. I want to get a composting toilet. This would allow me to remove the black water tank and replace it with another freshwater tank. Has anyone done this, or have any advice? Thanks in advance.

1992 Fleetwood, Pace Arrow, 32'.

[Dale_Traveling]

Easy project. The hardest part is finding a ready made tank to fit the space the black tank has. Probably the simplest way to transfer water would be using a portable pump when needed. And also use the pump to fill the tank. If you find one with the same foot print it would also be a back up to the primary. Just try and stay with a tank of the same water volume as the original black tank for weight considerations.

An alternative to consider would be to just leave the tank in place, seal the opening for original toilet and cross connect the two waste tanks increasing the gray water holding capacity. Easy enough to carry extra water externally while dumping, even gray water, anywhere other than at an approved facility can get you into trouble.

As far as when the day comes to sell the modified coach I wouldn't worry as long as you're considering do the mod to the 1992 Pace Arrow in your forum signature. Now if the coach was a 2012 may not the best idea considering your target buying audience would be a pretty small focus group.

[Clamrobot]

Ahh. That makes sense. I actually have yet to open it all up to see how things are connected. Thanks.

[gbopp]

Clamrobot wrote:
My main concern is more about routing new piping from the 2nd FW tank to the sink/bathroom. Would I need a 2nd water pump? Things like that. Thanks everyone for the replies thus far 🙂

You shouldn't have to route the pipes to the sink/bathroom. They're connected to the existing FW tank.
Just connect the two tanks so the water can flow between both. Depending on how the tanks are situated, you may or may not need a second pump.
You will need a vent on the second tank.

[Clamrobot]

I will find out if my sink goes to BW tank. Yes, I have used a composting toilet for about 3.5 months up in alaska,it worked just fine as long as you divert the urine into a separate container. Used with one other person it for 1.5 months before having to empty it. The waste just comes out looking/smelling of dirt.

My main concern is more about routing new piping from the 2nd FW tank to the sink/bathroom. Would I need a 2nd water pump? Things like that. Thanks everyone for the replies thus far 🙂

[bobsinn]

Make sure your sinks don't go into the Black tank, mine do.

[ksg5000]

I have never heard of anybody removing their black water tank. The chances of selling an RV without a black water tank has to be remote.

[gbopp]

Why not leave the black tank, install the composting toilet and try it for a season to make sure it will be practical?

Then if it works to your satisfaction, replace the black tank with a FW tank.

[ArchHoagland]

Have you ever done any composting with excrement? Years ago I did it with dog dodo and it was a long term disaster.