Help re toilet plumbing

[Fullabeer]

hi all, looking for some help with the pic above.

I’ve just installed this in my princess 33mk2. Previously the toilet (manual jabsco) pulled from the fresh water and waste went out the seacock- no holding tank.

As part of the upgrades, I added an electric conversion kit and put in a holding tank. To be river compliant, I added a diverter to the tank to allow pump out at sea via an anti syphon and using a macerater to suck waste and output to the seacock. The diverter also allows pump out (vacuum) via a newly installed deck fitting.

Problems:
1. Seaflo isn’t sucking up water from the water tank. Can get it to suck from a bucket.
2. Waste won’t pump out via the macerater. Pump whirls away but nothing comes out.

Looking at the diagram, can anyone add advice to follow??

Thanks in advance

 

[KevinV]

Dunno about 1, perhaps too small a vent on the tank? Re 2 the macerator should be on the other side of the anti-siphon loop surely? After the loop it'll pull air for preference

 

[markc]

Hi - a few questions...

1 - Why a macerator in the toilet and another one before exit?
2 - Is there a vent pipe in the holding tank?
3 - Why are you expecting seaflow to "suck" water from your freshwater tank, your domestic water pump should do this?
4 - related to above, you should have an anti-syphon device on the fresh water flush supply too.

ideally need to see the actual spec of what you fitted

 

[aerobat]

I have another setup which works , maybe this can help you a bit :

Toilet - diverter valve for either direct overboard or holding tank . after holding tank second diverter valve for either dock suckout or via second maceratorpump overboard .

 

[rogerthebodger]

My holding tank has 2 seperate outlets one for pump out and the second goes to the pump out so you don't need the outlet divert valves

My divert valve directs the outlet from the head to either overboard or to the holding tank

 

[Fullabeer]

Dunno about 1, perhaps too small a vent on the tank? Re 2 the macerator should be on the other side of the anti-siphon loop surely? After the loop it'll pull air for preference

Hi, the vent is a 1 inch pipe to a large hull outlet.

I also agree re the side the macerater is on (shop advised this side), but I tried blocking off the anti syphon and it made no difference

 

[Fullabeer]

Hi - a few questions...

1 - Why a macerator in the toilet and another one before exit?
2 - Is there a vent pipe in the holding tank?
3 - Why are you expecting seaflow to "suck" water from your freshwater tank, your domestic water pump should do this?
4 - related to above, you should have an anti-syphon device on the fresh water flush supply too.

ideally need to see the actual spec of what you fitted

The first macerater is built into the toilet. The second is purely acting as a pump.

Yes there is a vent pipe

The seaflo is designed to suck water. It works fine on a 10ft pipe in a bucket, just not from the water tank. I’m using the previous plumbing and this is unpressurised as the manual jabsco pumps suck

Why would there be an anti syphon from FW side? There wasn’t in the original set up. Would love to know.

Thanks again

 

[Fullabeer]

I have another setup which works , maybe this can help you a bit :

Toilet - diverter valve for either direct overboard or holding tank . after holding tank second diverter valve for either dock suckout or via second maceratorpump overboard .

Yes that’s what I would have done if space allowed as that’s a standard setup

 

[Fullabeer]

My holding tank has 2 seperate outlets one for pump out and the second goes to the pump out so you don't need the outlet divert valves

My divert valve directs the outlet from the head to either overboard or to the holding tank

Hi Roger,

The chandlers reckoned such tank caps didn’t exist as that would have been my choice also. I wonder if the tank screw caps are a standard size

 

[markc]

The first macerater is built into the toilet. The second is purely acting as a pump.

Yes there is a vent pipe

The seaflo is designed to suck water. It works fine on a 10ft pipe in a bucket, just not from the water tank. I’m using the previous plumbing and this is unpressurised as the manual jabsco pumps suck

Why would there be an anti syphon from FW side? There wasn’t in the original set up. Would love to know.

Thanks again

OK, I think I understand... you have used a conversion unit on the toilet with a built in macerator. There is no way you should be supplying fresh water to the toilet from your domestic water supply without having a syphon break... unless you enjoy hospital food. Also, those pumps are designed to be fed by sea water, not fresh water. Also, you would have been better off with a diaphragm pump as your pump out pump, as the waste would be pre-macerated. With the holding tank are you confident that the pipe inside the tank that sucks from the bottom hasn't fallen off?

 

[Fullabeer]

OK, I think I understand... you have used a conversion unit on the toilet with a built in macerator. There is no way you should be supplying fresh water to the toilet from your domestic water supply without having a syphon break... unless you enjoy hospital food. Also, those pumps are designed to be fed by sea water, not fresh water. Also, you would have been better off with a diaphragm pump as your pump out pump, as the waste would be pre-macerated. With the holding tank are you confident that the pipe inside the tank that sucks from the bottom hasn't fallen off?

The supply for the toilet was already in place and was fresh water as the previous owner said salt water made the toilet stink (i've heard this from others too). The Seaflo has a built in non-return valve fyi.

Re the pump out - Yes maybe a diaphragm pump would be better but 1. I've bought this one, and 2. I thought extra maceration wasnt any bad thing (thinking of toilet paper).

Re the tank - Nothing has been through it other than water so it was easy to screw off the top cap and check that the pipe is still connected, so sadly it wasnt that simple.

 

[markc]

Domestic water pump needs to be on as Seaflo unlikely to pull water past a pump that's off. Still don't think the set up is safe enough to stop bacteria contaminating your fresh water pipes.

With macerator have you pre filled the pipes to prime?

 

[Fullabeer]

Hi mark, yes I have tried to prime the pipes, but as the tank is the lowest point and the anti syphon is the highest point, they drain.