Home made waste pump

As I stated, it does NOT PUMP. It is gravity fed and if you look at the link design, the Black and Gray tank are ABOVE the Insinkerator and when he fires it up it grinds and GRAVITY and the force of the black/Gray water from the upper tanks push the debris out the Insinkerator thru the drain hose. So, what I stated is correct. Home disposals only grind and they are 120 volt. RV 12 volt macerators GRIND and PUMP the debris. A PORTABLE 12 volt RV macerator is $195 on Amazon with fittings to match RV's. CHEAP Garbage disposals are $65 up to the better ones at $130, THEN you have to modify and make it fit and then supply 120 volts to the Contraption. While you could save very few dollars, the plain fact is, it is just a crazy thing to do. Doug

i have been using my home made garbage disposal macerator for 5 years now at my seasonal site with great results they in fact do have some pumping action do to the centrifugal force of the cutter blades.
i tried gravity feeding my gray tanks and it took over 30 min. each through a 3/4" garden hose 75' to our dump station.
only takes 20 min. to dump all 3 of my tanks now. so much easier than multiple blue tank trips i used to do.
i found a brand new disposal in the box at a salvation army store for $25.00 and the rest of the parts were cheep coast me less than $60.00 to set it up.
an extension cord from the outside outlet powers it fine or can power it from the inverter in my truck.
i use one of these with the dump station size adaptor that comes in most dump hose kits.Camco 39111 Easy Slip Gray Water Drain Adapter