It is an object of the invention to provide a useful technique for reducing vibration of a handgrip and improving the cutting efficiency while achieving weight reduction of a reciprocating power tool. The dispenser has an overall specific gravity such that, when the dispenser is substantially empty of water-conditioningtreating agent, the dispenser will float, but when the dispenser contains water-conditioningtreating agents, the dispenser will sink. The elongated body member has a chamber defined therein that extends along the longitudinal axis, and a body wall surrounding the chamber. In a preferred embodiment, the coaster is made of an attractive fabric material.