Backflow

Backflow preventer devices are required by law to be installed in most commercial buildings, and some residential buildings whenever there is a chance that a “back flow” of water could be sucked [...]

Backflow preventers stop back-siphoning and backpressure from adding contaminated fluids or gases into a potable water supply system. Generally, the selection of the proper device to use is based [...]

You never know what a terrorist will do, that’s why they are so terrifying.  It has been known that they would like to poison our water systems.  To combat this possibility, several scenarios [...]