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! Proudly endorsed & recognised by trading standards. On any drain call we will camera one line that was cleared at no cost ($ value). Have a problem with your septic tank or cesspit? Baxi recommend adding water (and therefore pressure) via the.