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To remind yourself when you put the ISS into operation, please check the current month on the stamp and write the current year on the line provided. Water Quality Maintenance The Ionic Silver Stick® (ISS) keeps the water free of microbial growth. The ISS uses the anti-microbial effect of silver to prevent the growth of microbes in the water base. It begins to function as soon as it comes into contact with water, even if the unit is switched off. The Ionic Silver Stick should be changed every yea