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Started by Avonlea on Jul 27, 2020 6:33:55 PM
Unblocking a bathroom sink

The sink in our bathroom is blocked. Nothing is flowing down the plughole. Boiling water hasn't worked, nor has a plunger, nor using two different sorts of augur or those plastic strips with prongs for hair.

We can't really get a plumber out at the moment (we're shielding) so what are my other options?

Verdigris - 27 Jul 2020 18:35:54 (#1 of 97)

Caustic soda is you best bet, if you have any. It will dissolve hair, grease, people...

AdonisBlue - 27 Jul 2020 18:37:27 (#2 of 97)

Or buy some sink unblocker from your local shop, that's what I did when mine blocked a few weeks ago.

GyratingTrampoline - 27 Jul 2020 18:37:45 (#3 of 97)

My first move would be to unscrew and clean out the U-bend, if you're lucky there'll be a horrendous fatberg either in or reachable from it which will solve the problem. It's a yucky job so move everything like clean towels etc out of the area first and put a bucket underneath

Avonlea - 27 Jul 2020 18:38:54 (#4 of 97)

Sorry - meant to say that the u-bend is inaccessible.

We do have some drain unblocker that I was hoping not to use - the safety warnings are all dire. How long do you normally have to leave it?

Antimatter - 27 Jul 2020 18:39:19 (#5 of 97)

Ubend is the likely culprit, before unscrewing, try applying a hot hairdryer to the U bendy bit for a few minutes, this can sometimes work the magic.

AdonisBlue - 27 Jul 2020 18:39:39 (#6 of 97)

Before you start unscrewing anything or setting it on fire at least try a sink unblocking liquid gel from your local shop. Far easier.

Antimatter - 27 Jul 2020 18:40:06 (#7 of 97)

OOps, cross post, I normally leave drain unblock overnight, doesn't always work mind, but we are very hairy people.

Avonlea - 27 Jul 2020 18:40:31 (#8 of 97)

I think MrA's beard clippings are the culprit, myself.

AdonisBlue - 27 Jul 2020 18:40:36 (#9 of 97)

Yup works for me, sink unblocker overnight.

Avonlea - 27 Jul 2020 18:41:05 (#10 of 97)

How fumey is it? I can't leave the bathroom window open overnight and our bedrooms are on the same landing.

AdonisBlue - 27 Jul 2020 18:42:14 (#11 of 97)

Not very unless you buy the acid ones from D I Y shops. The gel ones from local shop are fine.

Verdigris - 27 Jul 2020 18:42:54 (#12 of 97)

How fumey is it?

If it is caustic soda (sodium hydroxide) based it shouldn't create fumes.

moto748 - 27 Jul 2020 18:44:30 (#13 of 97)

Sorry - meant to say that the u-bend is inaccessible.

How inaccessible is 'inaccessible'? Is it, for example, just a piece of plywood held in position by panel pins? I would still try to access it if at all possible. Failing that, try the gel caustic stuff. Sometimes they comes with a plastic 'barbed rope' kinda thing that you feed into the plughole and wiggle about.

deadmanwalking23 - 27 Jul 2020 18:49:00 (#14 of 97)

Vinegar and bicarbonate of soda

AdonisBlue - 27 Jul 2020 18:58:32 (#15 of 97)

No try liquid unblocker first before you start messing around with a U bend.

Verdigris - 27 Jul 2020 18:58:36 (#16 of 97)

Vinegar and bicarbonate of soda

One will neutralise the other.

bossab2 - 27 Jul 2020 18:59:21 (#17 of 97)

The acid ones shouldnt be sold to Joe Public.

(Judging by the way the stuff dissolved the metal plug fitting)

AdonisBlue - 27 Jul 2020 19:02:36 (#18 of 97)

This thread is a great example of how very intelligent people often overthink simple things.

My sink is blocked, what should I do?

Locate and find the U bend, undertake the difficult and messy job of unscrewing it and refitting it. Or develop your own formula sink unblocker using potentially harmful and gassing mixes of strong alkalis and acids.

Or you could just go to a shop and buy some sink unblocker.

Verdigris - 27 Jul 2020 19:03:49 (#19 of 97)

Or caustic soda, which is much cheaper.

dreams99 - 27 Jul 2020 19:05:27 (#20 of 97)

One shot. Leave it for 20 minutes, then run the taps.

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