Multistage water purification apparatus

A multistage water purifier comprising:

• an upper stage water purifier constituted by an upper pumping sleeve, a plurality of upper suction pipes opening into said upper pumping sleeve, a buoyancy chamber provided on the upper end of said upper pumping sleeve, a plurality of floats above the upper end of said upper pumping sleeve, connecting members connecting said floats to the upper end of said upper pumping sleeve for maintaining the upper end of said upper pumping sleeve a predetermined distance below said floats;
• a lower stage water purifier constituted by a lower pumping sleeve, a plurality of lower suction pipes opening into said lower pumping sleeve, an arcuate deflector attached to the upper end of said lower pumping sleeve, and a chain means connecting a weight to the lower end of said lower pumping sleeve, the upper end of said lower stage water purifier being connected to the lower end of said upper stage water purifier;
• and
• an intermittent air supplying means at the lower end of said lower stage water purifier and having an air chamber for feeding air intermittently, said air chamber including an outer cylinder having a top plate, an inner cylinder having a bottom plate and positioned in said outer cylinder and spaced from the inner surface of the wall thereof, an upper air relief pipe opening upwardly through said top plate and extending within said lower pumping sleeve upwardly into said upper pumping sleeve and extending downwardly into said inner cylinder to a point spaced from and opposed to the bottom plate of said inner cylinder, and a lower air relief pipe concentric with and spaced from said upper air relief pipe and opening upwardly through said top plate into said lower pumping sleeve and extending downwardly into said inner cylinder to a point spaced from and opposed to the bottom plate of said inner cylinder, and an air supplying tube connected to said outer cylinder for supplying pressurized air thereinto, said air relief pipes being sufficiently large to discharge into said pumping sleeves a bubble of air sufficient to substantially fill said pumping sleeves.