The Black water Sani Loo system (Port Midships Bilge) pumps flushed black water from the Black Water tank into the GREEN side of the SaniLoo system where it is mixed with Liquid Chlorine (from the YELLOW side of the Saniloo system) to sanitise prior to being pumped out through the through hull stop cock located above the waterline.

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(Note. there is a red LED on top of the Saniloo system which indicates low Chlorine levels.)

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The Saniloo system is fed 12v from the Saniloo trip located at the entry to the Port Engine room. 

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The pump is fed 12v from the Saniloo system when air pressure activates the low water Pressure switch located on the front left of the Saniloo Control box. Air pressure is localised within a 1.5in pipe in the top of the black water tank to facilitate this.

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The right hand pressure switch on the front of the control box works exactly the same but is for the high water alarm which sounds in the bar area above the black water tank.

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To ensure sanitisation prior to discharge, the control box will activate the pump for 30secs and then stop for 30secs. If the low water switch is still activated it will then run for an additional 30secs etc etc.

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There is a low water pressure switch override toggle switch located near the high water alarm in the bar area. This is an emergency override so that if the low water pressure switch fails and the black water tank fills to a level that activates the high water alarm, it can be used to safely empty the black water tank manually. (Note, this overrides the low water pressure switch so will continue to run regardless of fluid in the tank. The  pump is a gulper diaphragm pump so is ok to run dry, but the Saniloo system will continue to inject Chlorine so if left on all chlorine will eventually be used and there is a risk that untreated effluent will be discharged. The override does not negate the control system and the pump will continue it's 30second cycles to ensure sanitisation.)

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If the Saniloo system is not working;

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1. Don't panic, if the high water alarm hasn't activated you can use the manual override to empty the tank during a cruise. There isn't a way to monitor the tank level although a 1deg list with no guests on board is a tell that the tank is full.

2. Check the Chlorine low LED isn't on and refill with chlorine if necessary.

3. Check the Saniloo system is receiving 12v by activating the override and listening for the pump, if the pump doesn't start, check the trip in the Port Engine room.

4. Check for 12v at the Gulper pump on top of the black water tank, replace with spare located in the port midships bilge if necessary.

5. Check pressure switch by removing pipe from top of black water tank, and blowing down pipe gently to activate pressure switch.

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If the Gulper pump is blocked;

1. Remove the pipe from the black water tank to the Gulper pump at the Gulper pump. This is most likely where the blockage is. 

2. Try the outlet from the Gulper pump.

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If the toilet to black water tank pipe is blocked;

1. Use plunger on blocked toilet to attempt to remove blockage. Ask someone to observe other toilet, if the plunger sends air back into the other toilet, then the blockage is likely after the two toilet wastes merge.

2. In the midships bilge, remove the rubber sleeve on the 90mm waste pipe to gain access to the pipe inner. 

3. Use the Ryobi Wet Vac to suck out the blockage. Replace the pipe.

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