react with and oxidize other materials present in water w such as chloride bromide metallic silver metallic copper or metallic zinc to provide their respective more active forms hocl hobr ag cu 2 and zn 2 yet other versions of assembly 100 may include electrically conductive material or wiring as for example does hose segment 10 voltage generated by the photovoltaic material may be applied to the conductive material or wiring to metals containing one or more of silver copper or zinc the result can be conversion of the relatively insoluble forms of the metal into the more soluble and biocidally active forms ag cu 2 or zn 2 as a way to improve quality of water w various versions of assembly 100 may include one or more of sections 108 couplings 116 or attachments 120 or 124 having been coated with or containing thermally sensitive material thermal energy produced with emr impinges upon appropriate surfaces 128 a d or thermal energy from air or water the temperature of which has been elevated above that of the bulk pool water w by some natural or man made energy source can be transferred via thermally conductive material directly or indirectly to water w adjacent the interior or exterior of assembly 100 one suitable thermally conductive material is copper metal although persons skilled in the art will recognize that other materials also may be suitable for use as one such other example a bar of zinc metal directly or indirectly in thermal contact with infrared radiation ir will yield more zinc.