This manual vacuum is very easy to use: simply attach the unit to your hosepipe and switch it on. The venturi effect created by the water pressure creates suction which allos you to vacuum up debris from the bottom of your pond. The kit comes in two parts: • Power vac with nozzle to collect dirt • Hydro brush clicks which onto interchangeable handle Note: Manual vacs such as this one can introduce tap water to the pond which includes chlorine that would be harmful to your fish.