I was scanning some threads here and elsewhere with people offering all sorts of suggestions for using your garden hose to do everything from pressure test heater cores, flush radiators and spray gunk. Keep in mind that whereever the end of the pressure is reduced or stopped, everything up to that point is at one with your water system all the way back to your kitchen sink and ice maker on the fridge. I've seen people attach their garden hose to a sump pump to clean up after a sewer back up and then when finished reattach it to the outside hose bib and screw the nozzle back on the hose. The first time they turn the water on at the wall that contaminated water left in the hose will be at one with their drinking water. Next time you see a hose hanging in a radiator just think!!!