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Old 01-02-2019, 11:07 AM   #1
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Use a garbage disposal as a RV macerator?

Been looking at macerators for the RV. Discovered some use garbage disposals. Any one use such an arrangement? Any words of wisdom?
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Old 01-02-2019, 11:08 AM   #2
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Been looking at macerators for the RV. Discovered some use garbage disposals. Any one use such an arrangement? Any words of wisdom?
Like you... I've read about it.
Never seen it but not sure I'd want to either!

Best of luck if you do and post your results.
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Old 01-02-2019, 11:22 AM   #3
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A garbage disposal in the kitchen sink of an RV is probably not a good idea.

You most likely will have a real hard time trying to get that sludge out of the gray tanks.
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Old 01-02-2019, 11:33 AM   #4
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Macerators have a pump behind the grinder blades, garbage disposers do not. So you would have to have the discharge hose going down hill to the termination point, unlike the macerator that can pump uphill and long distances.
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Old 01-02-2019, 11:50 AM   #5
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They use the garbage disposal outside on the ground, similar to a 'normal' macerator. I even found a website that sells kits to turn a disposal into a 'macerator'. The video shows him 'pumping' 100 feet thru a garden hose and even holds the hose up seven feet with a steady flow.
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Old 01-02-2019, 12:35 PM   #6
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My house uses one, everything coming from the house is ground to a slurry and shot up a pipe the size of a garden hose 1/3 mile up the street to there the sewer pipe is as my house is well below the city sewer. Can't see why it wouldn't work for a camper other particles building up in the tank if not flushed enough.
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Old 01-02-2019, 12:59 PM   #7
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Why not? They make great margarita machines!

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Old 01-02-2019, 01:44 PM   #8
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Note to self after several Margaritas....
DO NOT use mixer for double duty as the sewer discharge piping.....LOL!
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Old 01-02-2019, 02:02 PM   #9
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I will attempt to re-claim this thread by re-asking if any one has any experience with the original subject matter? Would appreciate any feedback before I give this a try.

Watching a few videos of 'regular' macerators (with the 12 volt motors) pumping long distances, it seems they struggle, and the reviews are underwhelming. It strikes me that a larger motor on 120 volts might work out better, though they (garbage disposals) weren't intended to do this....at least I didn't think so.
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Old 01-02-2019, 02:23 PM   #10
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Been looking at macerators for the RV. Discovered some use garbage disposals. Any one use such an arrangement? Any words of wisdom?
http://www.forestriverforums.com/for...mp-114830.html

http://www.forestriverforums.com/for...ump-33481.html
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Old 01-02-2019, 02:36 PM   #11
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rockfordroo...thanks much. Looks like this idea has been around much longer than I was aware of. I have around a 75 foot run to make that is slightly uphill. Starting to think this might be something I will try.
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Old 01-02-2019, 02:37 PM   #12
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While I don't have any experience using a house-hold garbage disposal as a macerator pump, I do know that if you feed a garbage disposal too fast it will jam and lock-up. That's why they all come with the "oops" wrench.
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Old 01-02-2019, 02:45 PM   #13
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DW....hows things in Alaska? Not all that great in southern New Mexico today. I wondered about that too....too fast with the black water. From what little I've noticed is they seem to purposely put a 'kink' in the three inch hose when they first open the valve, then take it (kink) out as things slow.
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Old 01-02-2019, 03:06 PM   #14
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DW....hows things in Alaska? Not all that great in southern New Mexico today. I wondered about that too....too fast with the black water. From what little I've noticed is they seem to purposely put a 'kink' in the three inch hose when they first open the valve, then take it (kink) out as things slow.
35 degrees this am. Cloudy in the ANC area. Got light of day about 45 minutes ago. Gaining about 6 minutes of daylight each day. Earthquake damaged roads have been repaired to allow safe travel. Will require finishing repairs once winter is over. Several building around the metro area still require extensive repairs. For Alaskans, life goes on.

Apologies folks, didn't mean to derail the thread.
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Old 01-02-2019, 03:12 PM   #15
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The biggest issue I've seen from those using maceraters is what solids are left behind from not having the big 'woosh' of the 3" diameter hose when dumping.
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Old 01-02-2019, 03:37 PM   #16
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When you are faced with a 75 foot run...slightly uphill...aint going to be a big 'whoosh'. Have to grind it up and send it on it's way....a little at a time. 'Normal' macerators have a way to attach a water source so as to backflush in a way. My thought with the disposal set-up, once gravity has done its thing, hook up a water source to the black tank sprayer for a little extra clean out.
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Old 01-02-2019, 03:53 PM   #17
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Easy to do

Several macerator pumps are available on Amazon (not the brand names like shurflo) or if you are brave, Ebay. I bought the macerator pump and the parts to hook to a hose and a switch for under $100. I also bought a 100 ft 3/4 garden hose to reach my sewer. It works really well.
I looked at the garbage disposal but it costs as much and had to be heavily modified.I bought a Seaflo brand. There are several options but I bought the one that will hook up directly to my sewer outlet, bought some clear hose and fittings to adapt to garden hose threads, and hooked up a momentary switch.
The generator was in the next compartment so I wired up an 12V outlet box off the battery cables so I could plug it up with no problems.
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Old 01-02-2019, 03:56 PM   #18
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Here is what I use at home. Can adapt to a garden hose on the output. I can pump through a 100 foot hose with a a 4 foot rise. Search on Amazon.





Quick Release RV Macerator Pump - 12V, 12GPM.
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Old 01-02-2019, 04:21 PM   #19
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I use a Flojet (12v) Macerator pump, 100ft of 3/4'" hose most of which is coiled up. I pump it from my trailer up into my sewer line inside the house which has a 10ft rise, I have never had an issue. I use a hose to flush through the BW flush and also into the macerator pump to flush the hose.
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Old 01-02-2019, 04:28 PM   #20
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Have you considered a marine head with a built in macerator to replace your RV head (toilet) to liquefy the waste before it enters the holding tank? Then you could just use an appropriate pump for the liquid effluent...
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