NOVELTY - The method involves transducing water column oscillations to compress fluid. The fluid is compressed to pressure. The compressed fluid is accumulated. The accumulated fluid e.g. fresh water, is compressed to another pressure, where the accumulated fluid is free from salt and corrosiveness. A turbine e.g. non-self-rectifying turbine, and the fluid are isolated from a water column. Transducers (16) are connected between a low-pressure-float (12) and a high-pressure-float (14). A water-piston is made to slide within a water-cylinder under urging of an oscillating water column and gravity.    USE - Used in an accumulator for accumulating energy from an oscillating water column utilizing kinetic energy (claimed), for powering a machine e.g. turbine-generator-set, and for generating electricity, for driving a machine such as hydraulically compressed-gas machine, that is utilized for compressing and pumping fluid and for reverse osmosis filtration.    ADVANTAGE - The accumulated fluid is free from the salt and the corrosiveness, thus protecting the turbine from premature wear. The high pressure float and low pressure float provide constant elevation relative to tides. The water-piston is made to slide within the water-cylinder under the urging of the oscillating water column and gravity, thus conventionally harnessing energy from waves in an open body of water. The method utilizes an efficient non-self-rectifying turbine for pumping a bi-directional airflow by the oscillating water column under large and small wave conditions.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following:    (1) an apparatus comprising a transducing unit    (2) a method of using kinetic energy of an oscillating water column    (3) an apparatus comprising a piston.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of an energy accumulating apparatus.    Accumulator (10)    Low-pressure-float (12)    High-pressure-float (14)    Transducers (16)    Turbine-generator-set (18)