Fitting Dishwasher after Saniflo

[Old_Brown]

My son is fitting this close coupled basin toilet (below) into a newly created downstairs cloakroom.
He started to trench the floor to take a full size soil pipe (4 metres long!) but we stopped him! He's now got a nice deep trench - too shallow for a soil pipe but plenty for a smaller pipe - and we suggested he fits a saniflo (usual objections about noise and cost). However he also want to put a dishwasher into the same outflow.
Seeing at there is enough space in the trench, is he better off putting the dishwasher waste in separate pipe to run parallel and sorting out the pipes outflow once it's outside the house, or joining the dishwasher waste after the saniflo but before it goes under the floor?
And, what's the best saniflo to choose for this situation?

 

[oz-plumber]

I stand to be corrected, but I would assume you can't connect anything on the outlet drain of a saniflo.

The reason being that when the saniflo is in operation, the out flow from the saniflo has to go to a soil drain.

If the dishwasher was connected to the outlet of the Saniflo, when the Saniflo was in operation, then the dishwasher may end up with excrement within it drain pipe and probably the dishwasher itself.

Might not be healthy or pleasant

 

[Riley]

Agreed. Why can’t the dishwasher run in to the Sani flow

 

[Old_Brown]

Agreed. Why can’t the dishwasher run in to the Sani flow

Can the saniflo take hot soapy sodium hyrodxide waste from the dishwasher?
Are we not double pumping then - once from the dishwasher into the saniflo and then the saniflo?

 

[oz-plumber]

You could pump into the saniflo, but not into the outlet of the saniflo.
Big difference

 

[Riley]

Look on the Saniflo site it helps you choose the right pump. Or RPM our resident expert will no doubt see this later @rpm

 

[rpm]

I stand to be corrected, but I would assume you can't connect anything on the outlet drain of a saniflo.

The reason being that when the saniflo is in operation, the out flow from the saniflo has to go to a soil drain.

If the dishwasher was connected to the outlet of the Saniflo, when the Saniflo was in operation, then the dishwasher may end up with excrement within it drain pipe and probably the dishwasher itself.

Might not be healthy or pleasant

Would be ok if the dishwasher outlet joined the pump outlet from above and high enough and some distance away from the sani however that said I would run two separate pipes unless you knew what you were doing so yes I would go your way Oz.

 

[rpm]

Agreed. Why can’t the dishwasher run in to the Sani flow

Technically you can`t and to do so would void the warranty however that said within my own home I would do it but only in a certain manner.

 

[rpm]

You could pump into the saniflo, but not into the outlet of the saniflo.
Big difference

Only in a certain way to reduce the incoming water pressure and in the event of a warranty claim it could go against you.

 

[rpm]

My son is fitting this close coupled basin toilet (below) into a newly created downstairs cloakroom.
He started to trench the floor to take a full size soil pipe (4 metres long!) but we stopped him! He's now got a nice deep trench - too shallow for a soil pipe but plenty for a smaller pipe - and we suggested he fits a saniflo (usual objections about noise and cost). However he also want to put a dishwasher into the same outflow.
Seeing at there is enough space in the trench, is he better off putting the dishwasher waste in separate pipe to run parallel and sorting out the pipes outflow once it's outside the house, or joining the dishwasher waste after the saniflo but before it goes under the floor?
And, what's the best saniflo to choose for this situation?

View attachment 34769

Once you go down under the floor it has to be downhill all the way and a AAV may be required.

 

[Old_Brown]

It's always downhill all the way - it's called "life".

 

[Old_Brown]

Thanks All!

Seeing as we have the space and it's only going to involve a few metres of cheap polyweld, we will put the dishwasher in separately.
How will that be outside? Can I get two separate 22mm waste pipes into an inspection chamber and then into the soil pipe running from the stack?
I feel a need for an access / rodding point instead of just bossing them in underground