Bioflush is a drain un-blocker that uses non-chemical and environmentally friendly bacteria and enzymes to break down organic waste. The coke/pepsi idea is fantastic! i don't like either anyway, and it makes a lot of sense to use great hub and very useful as many have this problem at one time or another voted up! Sign up if you would like to receive occasional treats from us. Heating and hot water broke last night on the coldest night of the year the emergency.