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Old 01-30-2016, 04:33 PM   #1
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Black/Grey Water Pump

We only use our toilet to pee in so I don't need a grinder pump. I decided to use a small water pump to empty the grey and black water tanks so I can use a 3/4" hose. I want to use a small pressure switch to shut the pump off when the tanks are empty. Is there a suitable switch available?
Bill
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Old 01-30-2016, 05:00 PM   #2
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You will still have food particles and sometimes the odd sheet of tp going into the black tank, which will make quick work of the water pump. Why not just use a macerator or flojet pump designed for this purpose?
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Old 01-30-2016, 05:19 PM   #3
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Not sure where you would put a pressure switch. The discharge side is open to where ever you are dumping so very little pressure is developed.

Better idea is a float switch in the tank or in a seperate tank, connected to the dump valve.

Wire it to control the pump. Level goes up, pump goes on. Level goes down pump goes off.

Like a bilge pump in a boat. As a matter of fact I drain my shower in my boat like that, since it's below the waterline.

A small bilge pump with a float switch in a kitty litter bucket. I use a knee high stocking, to filter out the pump plugging hair and crud.
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Old 01-31-2016, 12:48 PM   #4
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Holding Tank Pump

I'll buy one of these and plumb it in.
http://www.xylemflowcontrol.com/file...0_950-0141.pdf

Bill
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Old 01-31-2016, 07:43 PM   #5
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That would work. The ready made flojet solution also incorporates a hose rinse feature which is probably a good idea. Keep us up to date with pictures.

On boats I've had to replace macerator pump impellers twice, not a very fun job! (ok, not as bad as the time we spilled part of a holding tank into the bilge ...) Make sure it's accessible for maintenance.

Because valves have to be opened and closed during the dump process, I'm not sure how beneficial an automatic switch would be. You wouldn't want sewage to be permanently sitting in the pump until ready to transfer out.

This might be useful for you http://manmrk.net/tutorials/RV/phred/macerator.html
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Old 01-31-2016, 08:42 PM   #6
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Sewer Solution is a non-electric option.

SewerSolution® System, Boxed - Valterra.com | Valterra.com
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Old 02-01-2016, 07:01 AM   #7
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Quote:
Originally Posted by marcham View Post
Keep us up to date with pictures.
I will post pics when I get it all plumbed up. Won't do anything until I get home next month.
Bill
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Old 02-01-2016, 08:46 AM   #8
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There are many float switches that could be used but as pressure switch,,, I don't think so.

As to "I don't need a grinder pump" no such animal (Ok there are but that's not what macerators are.. Most people think that but the Macarator is a couple. of blades kind of like a blender that simply stir stuff up.. oh they can break some stuff but mostly they stire and it breaks up on it's own.. The pump is a standard pump, no grinding happens in the pump part.. So I would recommend a macerator pump since it is specifically designed for the job. Sur-Flo has a "Gray water bypass" and if there is NO solid waste that will work as well.
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Old 02-01-2016, 06:56 PM   #9
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There are many float switches that could be used but as pressure switch,,, I don't think so.

As to "I don't need a grinder pump" no such animal (Ok there are but that's not what macerators are.. Most people think that but the Macarator is a couple. of blades kind of like a blender that simply stir stuff up.. oh they can break some stuff but mostly they stire and it breaks up on it's own.. The pump is a standard pump, no grinding happens in the pump part.. So I would recommend a macerator pump since it is specifically designed for the job. Sur-Flo has a "Gray water bypass" and if there is NO solid waste that will work as well.
I will get the Macerator pump for sure. Thanks for the clarification.
Bill
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