Grey waste (1 Viewer)

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Oct 2, 2022
1
0
Funster No
91,641
MH
kontiki sport
Hi we have a new Motorhome from last year and the grey waste basically trickles out. The fresh water is fine, but the grey has done it from new so shouldn’t be dirty. Any ideas how to speed water coming out? Thanks
 
May 7, 2011
6,103
32,912
East Anglia
Funster No
16,302
MH
Kontiki 669
Exp
Since 2010
Have you had the piping checked by the dealer as it is only a year old and under warranty?
It could be a blockage from when it was assembled.
 
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Apr 22, 2018
6,903
12,743
Herts.
Funster No
53,503
MH
Adria Coral lowline
Have you not got a hatch under the tank so you can stick your hand in there?

If not shove a running hose up the drain pipe, and flush it backward. It could be swarf or the cutout piece from when the tank was drilled for the pipes.
 
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Stealaway

Free Member
Jan 8, 2013
8,496
11,541
Dronfield - Derbyshire
Funster No
24,202
MH
Burstner Lyseo 690G
Exp
Happy FLT since 2011
As above with a hose pipe up it.
Are you sure that the valve is fully open

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Sep 17, 2020
959
3,168
Totton
Funster No
75,977
MH
Bailey Autograph 745
Exp
Since Sept 2020.
It could be a build up of grease - try running the hottest water you can get through it for a good while.

Also dissolving some dishwasher tabs in hot water, running that into the closed off waste tank and going for a run to swish it about a bit.
 
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Mar 11, 2013
1,291
1,707
Gillingham
Funster No
25,056
MH
coachbuilt
Exp
since 2005
My brother had the same problem on a new van. It turned out to be waste plastic in the tank from when the tank was drilled to fit pipework.
 
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Bobbydaisy

Free Member
Oct 13, 2021
517
749
Funster No
84,839
MH
Elddis CV20
Pipe or drain tap is possibly blocked. My Elddis CV20 has a 28mm hose from the tank then it’s terminated in a 10mm drain tap 😲. I changed it out last week to a 28mm drain tap which solved the issue with slow drain down on grey waste , but to note when I did change it there was a load of crap stuck in the rear of the tap which made it even worse.
 
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Jun 27, 2021
343
1,119
Lincolnshire, UK
Funster No
82,232
MH
PVC
Exp
Twelve months and still learning.
Plastic swarf is a good bet. When I last cleaned out my freshwater filter there were several pieces of plastic debris on there presumably from the holes cut in the tank during construction.
 
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