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Wash basin void fills with water?!?

Discussion in 'DIY Disasters' started by dogfonos, 8 Jun 2021.

  1. dogfonos

    dogfonos

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    OK, not exactly a disaster but it's weird...

    I clean my wash basin and bath drains by periodically blasting mains pressure water (via a hose) down the plugholes. Very quick, no chemicals and it does a great job. Done it a good few times and if careful, doesn't spray water around the bathroom.

    Last week, I thought the wash basin drain looked grubby so I gave that a blast too. After a few seconds, water began to run out of a small drain hole on the underside of the basin! WTF? Turns out that the basin overflow must somehow/somewhere be open to the ceramic washbasin void, i.e. the air space between inner and outer basin surfaces, and I had managed to fill (well, up to the level of the void drain hole - so about half fill) the void space with water.

    Obviously, I couldn't leave the water as it will soon 'go off' and cause odours. So, I carefully threaded a thin plastic tube through the small void drain hole and teased it into the area beneath the bowl (did it by feel as I couldn't see a thing). When I thought the tube was in place, I blew into it and heard bubbling water - proof that water now part filled the void. I managed to get a siphon going and removed over a litre of water. I think I had emptied the void but small amounts of water may have remained so I borrowed a pond aerator pump and set that up to blow air into the void for a few days. Nearly a week has passed and no odours as yet. Fingers crossed it stays that way.
     
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  3. Bonni

    Bonni

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    Sinks come in two types, solid and hollow. So there are two types of waste fittings that screw into the sink. D you have the correct one fitted?
     
  4. dogfonos

    dogfonos

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    Something to bear in mind when I refurb the bathroom.

    The current wash basin is definitely pre-1990 - I suspect it's a late 70's design. The plughole drain fittings don't seem to be the problem as I've blasted water down the plughole many times without the basin hollow filling up so I think the drain fittings are fine. Besides, if the basin hollow was somehow opened to the drain pipe just below the plughole, then any water collecting in the hollow should drain out, I think.

    The basin has an integrated ceramic overflow that's part of the basin's moulding so it's not user configurable. The ceramic overflow connects to the basin drain pipe just below the plughole and before the U-bend.

    It seems the overflow is open/vented to the basin's hollow space at the overflow's uppermost point, i.e. above 'normal' overflow water level. This may be done to prevent air locks when the basin overflows as the hollow space has a small drain/vent hole to the room. Who'd have thought it (not me, obviously)?
     
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