Blast It Out
This is a very simple, but helpful product. It allows you to clear clogged hoses with a garden hose. This is invaluable on a cruising boat. We had problems with our stateroom A/C, and we found that there was a clog somewhere between the output of the seawater pump and the condenser. We simply connected the blaster to the output hose of the seawater pump, turned on the water, and observed a bunch of blackish goo coming out of the thru-hull: problem solved!