Sink drains

[Mona Owner]

I am new to MoHo's and have found my kitchen sink quite slow to run away. Is there a benefit of running a liquid drain unblocker through it and if so, which one will not damage the system please.
Or should I try an old style plunger?

 

[ceejayt]

No benefit unless you really think there is something in there and it may damage the pipework. They are often slow

 

[tonka]

Be careful with plungers. Some vans have push fit pipes.. Last thing you want is to blow off a pipe somewhere you cant get at to fix. Motorhome drainage is not like houses, small 1" pipe. Being on an angle can make a lot of difference.

 

[TheBig1]

Several vans I have looked at because of very slow drainage had no vent from the waste tank. So any water going down the pipe needs to displace the same volume of air from the tank. Some manufacturers used to rely on venting via the shower drain, but the advent of "traps" to prevent smells now resists this ability. An empty tank with the drain open should allow the sink to empty fast. If not you have at best a partial blockage in the piping

As said, resist the urge to go at it with a plunger for the reason given, joints can separate and also the risk of damage to the sink itself

 

[pandas]

yes some are often slow - when in the Northern hemisphere wizz the water round clockwise and the reverse in the south.

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[Leith Laddie]

Our Autoquest 196 has the same problem, the mechanic at the dealership told us that this is a common design problem due to the sink being over the fridge. On further research it has been known as a design fault for many years, disappointing that Elddis haven't sorted it, not what you expect from a brand new motorhome! Our low tech solution is indeed a cheap plunger, seems to work but extremely frustrating.

 

[dunnah01]

Our sinks drain best when nearly level, anything else they take forever

 

[RobbyMClark]

If you can follow the pipes to the waste look for kinks or tight bents that you may be able to ease.

 

[Golden Graham !]

Ours is brand new so no chance of being blocked, but incredibly slow to drain.

 

[Jev88]

This may sound like a wind up buy bare with me. If you can take the pipe off under the sink ..... Blow down it and see what resistance there is. Assuming no pipe kinks it can indicate in my case there was no air vent from main tank. Added one myself and replaced some kinked pipe and although not perfect is a lot better.

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[Leith Laddie]

Ours is brand new so no chance of being blocked, but incredibly slow to drain.

Our MMH is brad new and also incredibly slow.

 

[Mona Owner]

Thanks for all your useful information. Much to think about. Many thanks. Alan

 

[Bigbass]

Our new CV60 had a similar problem and the waste tank was slow to empty through the little grey tap. On the back of this tap is a push fit larger pipe which I removed. The water flow increased and brought with it plastic swarf and other rubbish from the instalation I assume, even a black plastic disc from the hole cutter when the pipe had been fitted. I now back wash the outlet after each trip and the flows are much better.

 

[Shrimp]

MoHo sinks are very slow, our washroom one gallops out but the kitchen ones are very slow!
Angle of the van helps a little, and I do use a small plunger (found a small one in France) but use it seldom and very carefully!
Best to either throw water in hedge/down a drain or just walk away & do something else!