Slow draining Wash basin

[Joc]

Hi, I have a 2018 Adria Matrix 670SL Plus which we bought new. The wash basin has never drained properly I.e drains VERY slowly. Anyone else had this issue and have they resolved it?
Thanks in anticipation ?

 

[Vipar]

I have posted about this search my avatar vipar

 

[Badknee]

Check underneath the basin for a tight bend or squashed pipe. If it’s covered you may never be able to fix it.

 

[Joc]

Nope, no kinks as far as I can follow, which isn't far until it disappears under the paneling. Deeper investigations when we get home methinks (in Portugal at the moment) ?.

 

[Podney]

Methinks the kink is under the panelling....what joy!

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[Badknee]

Nope, no kinks as far as I can follow, which isn't far until it disappears under the paneling. Deeper investigations when we get home methinks (in Portugal at the moment) ?.

Hmmmm, sadly you may be right. You have checked that trap I take it?

 

[Vic. Parsons.]

Just a suggestion, looking at the first picture, that trap looks like a possible slow spot.
Perhaps if you removed it and put in a straight connector you could eliminate it as a possible cause.
I say this, because the traps in our Hymer look the same but are directly under the sink drain and therefore fed from the top, not the side like yours.
Might be worth a try?

 

[keithchesterfield2]

A rubber plunger from Poundland and a few swift plunges clears my waste pipes every time - just saying - it's not always rocket science to solve everything.

?

 

[pandas]

mine has been poor from new - told that the criteria from Hymer was that if it totally drained from full within 22 sec its within their permissible allowance - mine was 20! really slow and it must somewhere hidden as I have looked everywhere else.

 

[Joc]

mine has been poor from new - told that the criteria from Hymer was that if it totally drained from full within 22 sec its within their permissible allowance - mine was 20! really slow and it must somewhere hidden as I have looked everywhere else.

Just timed mine. 48 seconds ?!

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[Joc]

Just a suggestion, looking at the first picture, that trap looks like a possible slow spot.
Perhaps if you removed it and put in a straight connector you could eliminate it as a possible cause.
I say this, because the traps in our Hymer look the same but are directly under the sink drain and therefore fed from the top, not the side like yours.
Might be worth a try?

Not been able to investigate too far as I don't want to break something (it all seems a bit fragile). Will use your advice in my fault diagnosis when we get home ??

 

[Joc]

A rubber plunger from Poundland and a few swift plunges clears my waste pipes every time - just saying - it's not always rocket science to solve everything.

?

Just tried my mini plunger ?. No joy ?!

 

[Joc]

Hmmmm, sadly you may be right. You have checked that trap I take it?

Had a quick look, took the bottom removable part off and found it to be clear ?. Tried the drain rate whilst it was off, water drains away no probs. As I said in another post, I will investigate further once I'm back in blighty. Thanks for your help and advice ??

 

[tonyidle]

Just occasionally (ie when it's cheap & easy to do) converters have a long horizontal pipe run from the end of the vertical section under the sink to the inlet of the waste tank. Which means that if the van is very slightly tail up when parked the drain air locks. If yours is cured by parking ever so slightly tail down you have the same problem as I.

 

[Joc]

Just occasionally (ie when it's cheap & easy to do) converters have a long horizontal pipe run from the end of the vertical section under the sink to the inlet of the waste tank. Which means that if the van is very slightly tail up when parked the drain air locks. If yours is cured by parking ever so slightly tail down you have the same problem as I.

Hi, thanks for that. Our van sits naturally nose down. Obviously, when we stop, i always adjust it to sit level. Next time we stop I'll try giving it a bit of a nose up attitude and see what happens ??. ?

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[Vic. Parsons.]

Had a quick look, took the bottom removable part off and found it to be clear ?. Tried the drain rate whilst it was off, water drains away no probs. As I said in another post, I will investigate further once I'm back in blighty. Thanks for your help and advice ??

Another thing you could try
You said you removed the bottom cover of the trap, did you have a poke around on the exit side of the trap, I've found bits of hair etc clogging the outlet side on ours and this causes a slow flow.

 

[Joc]

Another thing you could try
You said you removed the bottom cover of the trap, did you have a poke around on the exit side of the trap, I've found bits of hair etc clogging the outlet side on ours and this causes a slow flow.

Yeah, I checked for that ?. We bought the van new and it's always been slow draining ?! ?

 

[rosalan]

To date I have tried a plunger, this does work.
A hose under pressure, quite a lot of pressure, this seems to work perfectly for a few minutes....only.
Passing the problem on, as the van is still under warranty. They said they removed some material, poured some cleansing fluid down and power hosed it.
The plunger is still required!
I think there is a kink or slight twist somewhere, for once water is encouraged to flow, it continues for a few moments.
If ever the weather gets warm and dry I may try and look underneath.

 

[mitzimad]

the knurled nut twists of the bottom of the trap have you checked it for fat and grease build up

 

[rosalan]

I am not too sure what/where you mean but the dealer (and I) have power flushed with a hose and they put cleaner down the drain.

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[Joc]

To date I have tried a plunger, this does work.
A hose under pressure, quite a lot of pressure, this seems to work perfectly for a few minutes....only.
Passing the problem on, as the van is still under warranty. They said they removed some material, poured some cleansing fluid down and power hosed it.
The plunger is still required!
I think there is a kink or slight twist somewhere, for once water is encouraged to flow, it continues for a few moments.
If ever the weather gets warm and dry I may try and look underneath.

I haven't gone so far as to power flush but I do get the same symptoms as you describe about it sometimes flowing for a few moments ?. When we get back from touring round Spain and France I shall be exploring the issue further ??. Joc ?

 

[pappajohn]

If they used convoluted flexible hose throughout it will be slow.
The convolutions cause a turbulant flow, the longer and thinner the hose the more restrictive the flow. It also collects small bits of food waste in the convolutions eventually restricting the internal diameter.
Straight plastic tube will allow a smooth faster flow.

 

[Landy Andy]

Just to clarify things, the OP has said basin, so I doubt any problem with food waste or grease/fat.

Basin is in a bathroom, a sink is in a kitchen

Joc Can you please confirm that is correct.

 

[Joc]

Landy Andy, it's the basin in the toilet which is very slow draining ?. Both the kitchen sink and the toilet basin drain through convoluted plastic pipes. Have no probs with the kitchen sink drain ?. Joc ?

 

[rosalan]

As a point of interest, I power washed (sealed a hose with strong water pressure) to the kitchen sink and was amazed how much clag came out of the drain.

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[Joc]

Was there a problem with the draining of the kitchen sink ??

 

[pappajohn]

Just to clarify things, the OP has said basin, so I doubt any problem with food waste or grease/fat.

Basin is in a bathroom, a sink is in a kitchen

Joc Can you please confirm that is correct.

I only half read the op so my fault.
Could still be the convolutions causing a turbulant vortex though.

 

[Joc]

I only half read the op so my fault.
Could still be the convolutions causing a turbulant vortex though.

Yeah you could be right there. The toilet basin drain is across the van from the grey tank so there must be a flat run which , coupled with the convoluted pipeline, could be causing air locks ?. Also the run of the pipe could be upwards into the waste tank ?. Again, something to be investigated on our return ?. Joc ?

 

[John and Jo]

My hand sink is very slow and I've tried to get it to go quicker but I reckon it's air locked. The sink in the kitchen feeds into the same pipe as the bath sink but the kitchen has an overflow, so I reckon that helps. Plus it's a bigger plug hole.

 

[Joc]

My hand sink is very slow and I've tried to get it to go quicker but I reckon it's air locked. The sink in the kitchen feeds into the same pipe as the bath sink but the kitchen has an overflow, so I reckon that helps. Plus it's a bigger plug hole.

Just to confirm, are the "hand sink" and "bath sink" both referring to the wash basin in the toilet? My kitchen sink doesn't have an overflow but it is a larger plug than the toilet wash basin.
I'm thinking of investigating the possibility of installing a breather pipe in the waste pipe from the toilet basin to see if that alleviates any air locks. Shouldn't be too difficult ??! Joc ?

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