Lurking danger in thurrock's hosepipes - your thurrock. We also offer quotes outside the anchorage area for a fee. If pressure has dropped once, it will drop again. One million cfm plant ventilation project. Advantages of hydro-mechanical drain cleaners are their eco-friendliness (most use only tap water), their ability to dislodge and remove clogs like sand or cat litter that 'back-fill when using a conventional snake, and their friendliness to plumbing joints unlike air-burst cleaners,.