Concrete Blocking Cellar Drain

[John Peden]

Try this https://photos.app.goo.gl/KY3kRqc8rSJokWTb6

 

[Ian H]

If you could knock a hole through the trap the pipes would bypass the concrete but you would need to seal it to stop any sewer smells coming back

 

[Lower]

Our old boiler condensate used to drip on to a cement fillet around the drain. Over approx 5 years of use it had formed a hole around the size of a 50p piece around 10-15mm deep.

Using condensate to dissolve the block might take a while....

Before you start tipping acid down the drain you might just want to check that the salt glaze will resist brick acid. I think it will, but the last thing you want is to dissolve the whole. I would also suggest going for the strongest brick acid you can get (in excess of 30%) or it will take forever to work.

 

[John Peden]

Before you start tipping acid down the drain you might just want to check that the salt glaze will resist brick acid. I think it will, but the last thing you want is to dissolve the whole.

Just test on a small section of it first?

 

[Lower]

Just test on a small section of it first?

A few drips left on an exposed surface to see if it reacts would be sufficient.