METHODS FOR PRODUCING ACTIVE WATER, FOR REMOVING RED WATER BY ACTIVE WATER, FOR REMOVING UROLITH BY ACTIVE WATER, FOR STABILIZING CHLORINE CONCENTRATION IN SWIMMING POOL BY ACTIVE WATER, FOR REMOVING SCALE IN HOT SPRING PIPING, FOR RUST PREVENTION IN BOILER, FOR PURIFYING POND WATER, AND FOR PURIFYING WATER IN VESSEL FOR AQUARIUM FISH