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Old 11-24-2020, 12:53 PM   #1
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Macerator question

My gray water is drained by a macerator (Winnebago Aspect). I want to run fresh water into the black tank using a rhino blaster since it was in the assorted sewer fittings that came with the rig. And I don't have a wand or gotten around to putting in a black tank flush valve or want to drag a hose through the rig. I can't (easily) close or disconnect the macerator out line. Using the blaster would result in water heading to the macerator output.

Question... Will whatever pressure is presented by the time water gets to the macerator presumably making the blades go in reverse cause any problems with correct functioning when I want it?
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Old 11-24-2020, 06:31 PM   #2
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If there was any doubt you could just turn the maceator on when you were flushing. I believe that's what mine calls for. I've taken a maceator apart and really don't think water pressure is going to do any damage IMO. The blades are rubber from what I've seen and they likely won't move unless the motor is on.
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Old 11-24-2020, 09:08 PM   #3
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Not sure about the Winnebago macerator design.
Full timers for over 8 years now. Using a macerator the whole time.
I have a black tank “cleaner” installed, nothing like that in the gray tank.
My San-I-Con macerator (permanent mount) has steel blades. The 3” black and 1-1/2” gray pipes hook together into the 3” dump pipe. A 3” flex hose hooks to that 3” pipe and then to the macerator. This puts ALL the water thru the macerator, thus chewing the poo and pumping the waters out.
I will, at times, hook a valved “y” to the discharge hose at the macerator. This allows me to push water (from a hose) back thru the macerator. I do this to “clean” hair and build-up out of the macerator blades. Also, I can push extra water into the tanks.
Never really thought about “cleaning” the gray tank until I read your post. Might have to do it next time I dump!
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Old 11-24-2020, 11:35 PM   #4
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Quote:
Originally Posted by Greg121 View Post
My gray water is drained by a macerator (Winnebago Aspect). I want to run fresh water into the black tank using a rhino blaster since it was in the assorted sewer fittings that came with the rig. And I don't have a wand or gotten around to putting in a black tank flush valve or want to drag a hose through the rig. I can't (easily) close or disconnect the macerator out line. Using the blaster would result in water heading to the macerator output.

Question... Will whatever pressure is presented by the time water gets to the macerator presumably making the blades go in reverse cause any problems with correct functioning when I want it?
Sounds like Previous Owner used it....
Go for it.

**Black tank is a 3" line that goes directly into black tank
Grey water macerator uses a hose that goes from macerator outlet all the way over to black tank drain line
3" is less restrictive and little if any flush water is going up into that hose and over to macerator....plus if it did it wouldn't create much pressure on the pump.

Go for it
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Old 11-25-2020, 09:20 PM   #5
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I've have a macerator pump in my current rig, as well as my previous one. I typically close the gray tank valve the day before I plan to drain the black tank. This allows the gray tank to accumulate some water from dishes, showers and laundry. The next morning, I pull the black tank valve and turn the macerator on. Once the black tank is "empty" I turn the macerator off and leave the black tank valve OPEN. Next, I open the gray valve (leaving the pump off), count slowly to 10, close the gray valve and then turn the pump back on. This process effectively "backwashes" the black tank and you'd be surprised how much stuff it brings out of the black tank. I repeat these steps until I'm satisfied the black tank is clean enough. I've been doing this for the 13 years I've been using a macerator and I've never had a problem.
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Old 11-25-2020, 10:17 PM   #6
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OP has a 'Winnebago Better' Idea for grey tank --- macerator pump at grey tank outlet with a discharge hose that goes over to black tank outlet

NO SHUTOFF/ISOLATION Valves on grey tank, macerator or at connection to black tank outlet


OP....
Can you access that discharge hose?
Install a 'check valve' so no backflow into macerator hose/pump when back-flushing black tank
**Maybe it already has one?????
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