The replacement, free floating Impeller
for the Aqua Clear 201 Powerhead is for aquariums up to 20 gallons.
Unplug the power head and empty the water out of the power head. Then remove the
housing over the impeller. Remove the old impeller and check for any damage that
me be on the magnet and it's housing. Replace with new impeller. Be sure to take
out the new impeller and clean it at least once every two months to ensure the
long life of the impeller unit.