Sulphuric Acid

[Bas]

Hi all,
I have a 32mm waste pipe which is vitually blocked with soft deposits (I cut it to move the sink). The pipe goes under the floor and I dont want to replace it if I dont have to. Can anyone recommend the best substance for clearing it once the new sink is connected? There wasn't a problem before with emptying the sink but I'm keen to avoid one in the future. I've used sulphuric acid on external drains and that worked well. Thanks

 

[breezer]

caustic soda is very good, but do read instructions first, if not it will BLOCK the pipe

 

[taydo]

I quite often go out to pubs and use sulphuric acid based drain cleaner
its very good I use one big shot to get it clear then the customer uses another litre over the course of a week to clean it.

It saves a lot of disruption.

Make sure the trap is clean first and stand back coz it takes no prisoners.

 

[Bas]

thanks guys