Slow draining water pipes

JVB, with respect, I don't think the MH waste points have much to do with this OP. It sounds like a slow draining sink into waste tank, either onboard or into a wastemaster. Either way, it's the onboard pipe work that is the issue. It's not clear if the OP owns a van or a MH.

On my previous Clubman ES the sink drainage was pathetic. I had to take the caravan to the dealer for another reason and asked that they sort out the sink drainage. They rerouted the pipework and all was fine. Present caravan is no problem - same model but later version. Certainly worth checking underneath.

Thanks to all , sorry, we have a motorhome and the problem is with the sink.. We do use a bowl and straner in the plug hole and also put Thetford Blue down and waste tank cleaner to no avail.  It has always been slow but this last holiday was very slow.  Will try a plunger on next visit and maybe Cola. We are not very technically minded so altering anything maybe doing more harm than good! Thanks again

You put toilet chemical in your waste water tank! I’m not sure that’s a great idea as waste tanks are not of the same construction as toilet cassettes.

BBoy was who I was answering,to what he has at last admitted

When you say Thetford Blue do you mean the Thetford Tank Cleaner, which happens to be blue? I have used that but really just to freshen things up. You seem to be taking sensible precautions to prevent rubbish blocking the pipe so it's possible that it is just a slow draining sink. I did wonder about suggesting a washing soda solution which might help. However you do have to be so careful with general kitchen chemicals that they don't attack connections etc.

David

In all the years we've been camping, with numerous units, we've always had similar problems. As well as the comments already made above it also depends how level your unit is at the time etc etc. It's very rare the pipes are blocked, more than likely very thin and/or routed poorly. Some days ours drain ok, some days not.

The best method I have of dealing with this is to buy a cheap plunger and if the sink decides not to drain, I just give a couple of light plunges and normally that sorts the problem just fine. Don't be too rough, you don't want to break anything further down the pipe with too much pressure, just enough to create a little suction. I hope this helps.

Beware the plunger if you have push fit pipes.  It will push them apart. Perhaps not straight away but enough to just hold until there is a build up of something nasty!

My caravan is trailer not motor so I was able to modify the galley waste by removing the bend where it turned to go along the underside of the floor. It now exits straight into the Wastemaster with a very satisfying whoosh.

Our Autotrail Apache 634 has the same problem with the sink which is located above the fridge. I have had the pipework apart several times trying to improve the flow, and the dealer has also checked it out !

Hallsontour has said it depends upon how level the van is, and this is true in our case. If the van is down at the front the sink takes ages to drain. If it is level, or slightly up at the front the flow improves, so we always make sure we have the level correct.

it was posted in the motorhome section....but this may not mean anything i agree