Drain blocked

[shedi123]

Can anyone advise?
My drain was blocked to my bathroom so I removed the U bends cleaned all the gunk out of them and I also used my cable rods to push up and down the 3m run of pipe. After a good roddin there was a load of lime scale that I dislodged. I picked out what I could but some of it has fallen futher down the drain were I can't access. My bathroom drains a treat now until the water gets so far and then backs up again. Basically is there anything that will disolve the lime scale as I now know this is definatly the problem.
Thanks in advance.

 

[bengasman]

You could try drain unblocker. Be very careful as it will dissolve your skin just as happily as limescale.

 

[shedi123]

ok, i wasn't sure how affective they were but its worth a go

 

[bengasman]

Acid tends to work pretty well on limescale.
Oldest clothes, goggles and long thick rubber gloves recommended.
And poor it bit by bit, not all in one go; when mixed with water the chemical reaction can get it pretty hot.

 

[Homesafe]

won't aggresive cleaners like these damage seals on pushfit, Ben?

 

[shedi123]

Acid sounds like a plan. Where can I get it from and any particular type?
It won't affect any seals etc to where I'll be using it as its basically down in the main drain in the ground.

bath sink
L________L______________
|
down into drain
No inspection cover so can't rod drain
This is where it is blocked with lumps of
lime scale

 

[bengasman]

I have used various forms of acid for cleaning different things over the years, and afaik, ally heatexchangers are the only things that don't like it.