Abstract: Systems and techniques of treating water can be performed by utilizing characteristic functions to generate a control signal to regulate addition of a disinfecting species to the water. The characteristic functions, which can be a dynamic chlorine redox relationship between the oxidation-reduction potential and the concentration of free available chlorine species in the water, can be mapped, at least in part, by a corresponding sets of measured process parameters of the water. A triggering condition can initiate change and identification of the characteristic function.

Abstract: The present invention describes a barrier layer composition which is applied to at least one surface of a plastic body, preferably a polyolefin hollow body, having the following composition:(a) 35 to 75% by weight of an epoxide-containing or halogen- and epoxide-containing metal oxide sol;(b) 20 to 60% by weight of a fluorine- or sulfo-containing maleic acid hemi ester copolymer or a fluorine- or sulfo-containing maleic acid hemi amide copolymer having the general structural formula ##STR1## wherein M=vinyl monomer; X=oxygen, nitrogen;Y=--(CH.sub.2).sub.n --SO.sub.3 H, --(CH.sub.2).sub.n --F, --(CF.sub.2).sub.n --H;n=2 to 12;(c) 0.5 to 5% by weight of a catalyst based on one or more tertiary amines.

Abstract: The present invention refers to a barrier layer composition which is to be applied to at least one surface of a polyolefin body, in particular a polyolefin hollow body, wherein the composition contains: a) 40-70% by weight of one or more epoxide-containing metal oxide sols; b) 25-55% by weight of a binding agent polymer consisting of a terpolymer of maleic acid-maleic anhydride-vinyl monomers and/or a copolymer of maleic acid-vinyl monomers having a composition by mole of 50-75% of a vinyl monomer, 5-50% of maleic acid, and 0-20% of maleic anhydride; and c) 0.1-5% by weight of a catalyst on the basis of one or more tertiary amines.The hollow bodies coated with the barrier layer can be used particularly as storage containers for organic substances, in particular for organic solvents, fuels, mineral oils, pesticides, and other substances, for example liquids, the diffusion of which is to be inhibited or at least essentially reduced.