Wow!!!! lifeline plumbing far exceeded our expectations! they did a phenomenal job on our renovation project and completed the job ahead of schedule! so easy to work with too! thanks for doing what you said you would do! Sometimes the flue gases get so cool that the water vapour in the gas condenses out (hence the name), and even more energy is recovered from the condensing vapour. Used the whole bottle overnight to unblock a slow running bathroom (bath and loo) pipe water now runs freely.