Aquarium filtration indicator

Claim 1

An aquarium filtering device in combination with an aquarium tank having contaminated and decontaminated water therein, said filtering device comprising in combination a housing provided with three chambers defining a first inlet chamber in fluid flow relation with the aquarium tank and a second filtration chamber in fluid flow relation with said first inlet chamber and a third outlet chamber in fluid flow relation with said second filtration chamber, a mass of filtering material in said second filtration chamber, said third outlet chamber being provided with opening means for ingress of air into said third outlet chamber and egress of decontaminated water out of said third outlet chamber into the aquarium tank, said first inlet chamber being provided with inlet means comprising an inlet through which contaminated water from the tank may flow, an air stream supply means disposed in said third outlet chamber which directs ingressed air from said opening means into said third outlet chamber thereby when the filtering material is unclogged causing contaminated water from the aquarium tank to flow through said inlet into said first inlet chamber and therefrom into said second filtration chamber where the contaminated water is substantially decontaminated by the filtering material before flowing into said third outlet chamber and being egressed through said opening means into the aquarium tank, and indicating means associated with said first inlet chamber and responsive to flow of water from said inlet to said second filtration chamber for signalling flow of the contaminated water through the filtering material, said indicating means including a rotary shaft supported in said first inlet chamber, said shaft being provided with at least one helical impeller for indicating rate of flow of the water from said inlet to said second filtration chamber.