NOVELTY - The apparatus has a measurement tank (72) for measuring water quality such as total organic carbon, chemical oxygen demand (COD), pH, oxidation-reduction potential of to-be-processed water flowing into liquid treated water tank (1). The water quality of to-be-processed water which flows out of water tank is measured by measurement tank (57). The bubble generators selected from nano bubble generator (47), micro bubble generator (78) and submersible pump type micro nano bubble generator (52) are operated or stopped based on the water quality before and after processing.    USE - Water treatment apparatus processing of tap water, wastewater, organic fluoride compound containing wastewater, bathtub water, fish-culture water, water culture medium, beauty treatment water, petrol, bedsore water, water used for treatment of atopy disease. Can also be used in processing drug, organic solvent, bioethanol, etc.    ADVANTAGE - Water processing can be performed with a small amount of energy. Synergistic effect can be anticipated. Turbulent flow of to-be-processed water can be controlled so as to generator bubble efficiently.    DETAILED DESCRIPTION - The apparatus has a liquid treated water tank filled with polyvinyl alcohol, activated carbon, calcium carbonate mineral and polyvinyl chloride filler. An UV ray is irradiated with respect to to-be-processed water by UV ray reactor (66). The gas discharged from circulation pump (65) for a period of below 1.2L/min and above 0.6L/min is sheared by a gas shear unit (4) while mixing the to-be-processed water and gas. The magnetic water activation of the to-be-processed water is performed by discharge side magnetic water activation device (9). The flow rate of to-be-processed water is controlled by a control unit. The depth of each groove formed in pipe of gas shear unit is set to 0.3-0.6 mm and the width of each groove is set to 0.3-0.8 mm. The gas is supplied with an incident angle of 17-19 degrees with respect to center axis of gas shear unit. The thickness of main portion of gas shear unit is set to 6-12 mm. INDEPENDENT CLAIMS are included for the following:    (1) processing method of tap water;    (2) processing method of wastewater;    (3) processing method of organic fluoride compound containing wastewater;    (4) processing method of recycling water;    (5) processing method of bathtub water;    (6) processing method of fish-culture water;    (7) processing method of water culture medium;    (8) beauty treatment water processing method;    (9) processing method of petrol;    (10) treatment water processing method of bedsore;    (11) treatment water processing method of atopy disease; and    (12) water treatment method which involves storing the to-be-processed water in liquid treated water tank, and measuring the water quality before and after processing. A bubble generator is selected from several bubble generators based on the measured water quality. A nano-bubble or micro nano-bubble is generated by the selected bubble generator.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the water treatment apparatus.    Liquid treated water tank (1)    Gas shear unit (4)    Nano bubble generator (47)    Discharge side magnetic water activation device (9)    Micro nano bubble generator (52)    Measurement tanks (57,72)    Circulation pump (65)    UV ray reactor (66)    Micro bubble generator (78)