NOVELTY - A liquid is contacted with a container of ceramic particles. The vibrational energy is focused, reflected and refracted within liquid. A compressional wave arises in liquid level of liquid, and inside the liquid. A cavitation is generated with negative pressure by the liquid level of liquid, or the compressional wave inside the liquid. A bubble generated with respect to cavitation is destroyed, and vibrates violently by resonance effect. The surface tension is reduced by increase of surface area of liquid, and generation of shock wave by bubble destruction.    USE - Reduction of surface tension and dissolved oxygen of liquid such as water for removal and protection of scale of sewer pipe, removal of urinal scale in toilet, reduction of generation and growth of aerobic organism such as oyster and barnacle, reduction of detergent, reduction of cement admixture, function-maintenance of heat exchanger, and growth promotion of anaerobic organism such as lactic acid bacteria and yeast.    ADVANTAGE - The method provides liquid having excellent antioxidant activity, and the wettability of substance and water, and cleaning power are improved. The cleaning force of contamination is improved with respect to force of shock wave by bubble destruction. The dissolved oxygen (biological material which uses inorganic compound other than oxygen as an electron acceptor) is reduced by bubble discharge, and the anaerobic respiration is activated. The fermentation (biological material which uses an organic compound as electron acceptor) is activated, and hence proliferation rate of aerobic organism is improved. The oxidation rate of substance is reduced. The activity of aerobic organism (biological material which uses oxygen as electron acceptor) is reduced, and hence the reduction and extinction of proliferation of aerobic organism is carried out.    DETAILED DESCRIPTION - A liquid such as water is contacted with a container filled with ceramic particles comprising a sintered compact of a high-temperature-baked oxidizing type mineral. The ceramic particles collide by passage flow rate of liquids and mutual-rubbing. The vibrational energy such as ultrasonic wave generated from sources is hard to transmit to other substances by intrinsic acoustic impedance, and is focused, reflected and refracted within liquid as a retardation medium. The oscillatory waves such as ultrasonic waves are maintained to the retardation medium for a long period of time. The medium repeats swelling and compression. A compressional wave arises in liquid level of liquid, and inside the liquid. A cavitation is generated with negative pressure by the liquid level of liquid, or the compressional wave inside the liquid. A bubble generated with respect to cavitation is destroyed, and vibrates violently by the resonance effect. The cavitation and bubble destruction are easy to generate. The countless capillary waves such as fine-bristle surface waves are built on the liquid level. The surface tension is reduced by increase of surface area of liquid, and generation of shock wave by bubble destruction. The dissolved oxygen is reduced by bubble discharge.