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Author Topic: fully emptying black tank with 3" hose  (Read 113 times)

Murray

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fully emptying black tank with 3" hose
« on: December 10, 2018, 03:18:46 PM »
Roadtrek Zion:
While winterizing after draining black then grey through the macerator I opened the 3" gate valve. The instructions said to have a container for a small amount of liquid, I got about 1.5 gallons and it wasn't all liquid.

In order to fully drain the black waste I will need to use a 3" hose, but there's no external storage.
Any suggestions?

blw2

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Re: fully emptying black tank with 3" hose
« Reply #1 on: December 10, 2018, 03:30:28 PM »
sorry, I don't understand your question.

I have no experience with a macerator on an RV, but I'd imagine just by the nature of the fittings and connection that it would never completely drain dry.

I really don't think that it does even with the traditional large hose....and it's not like it's a rapid rush of water whenever it gets down to even several gallons left...so solids will always remain....even after several fills and dumps with clear water.

but
why does that really matter?

Brad (DW + 3 kids)
13 Thor Chateau 31L Class C on Ford E-450
'06 Silverado
'05 Rockwood Freedom 1910 (5-1/2 years)
former tent campers

phil-t

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  • Moving Along
Re: fully emptying black tank with 3" hose
« Reply #2 on: December 10, 2018, 04:17:18 PM »
Close the valve and add some RV antifreeze?
2010 Winnebago Vista 32K on an '09 F53 22K Ford V-10 gas chassis.
2014 Cadillac SRX in tow.
CHF, DIY rear TrackBar
Retired - Moving Along

Murray

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  • Posts: 19
Re: fully emptying black tank with 3" hose
« Reply #3 on: Today at 02:45:02 AM »
sorry, I don't understand your question.

I have no experience with a macerator on an RV, but I'd imagine just by the nature of the fittings and connection that it would never completely drain dry.

I really don't think that it does even with the traditional large hose....and it's not like it's a rapid rush of water whenever it gets down to even several gallons left...so solids will always remain....even after several fills and dumps with clear water.

but
why does that really matter?

I agree there will always be a small amount, but the tank is only 46litres, so having 6 litres left is over 10%. I would like to empty it completely, not just for winterizing, but to enable maximum capacity for when we plan a longer dry camp. To do that I either need a suitable container or the ability to store a black water 3" hose. We're  not keen on the hose being inside the living area and there's no real outside storage so I wondered how/whether other class B owners dealt with this? (roof covered in solar panels)