Used the whole bottle overnight to unblock a slow running bathroom (bath and loo) pipe water now runs freely - exceeded my expectations! Joule devised a brilliant experiment he attached a heavy weight () to a rope looped over a. Service was great and i would highly recommend koegel to anyone if you need plumbing done they're the ones to call! A combi boiler is a high-efficiency boiler which acts as a water heater and a. We had an overflowing clogged toilet they came quickly.