Nu-Calgon - Pan-Treat™ condensate tablets control odor and can prevent overflows by plugged condensate drain lines. They can also be used on humidifiers. Pan-Treat™ is extremely easy to use, and is safe, non-corrosive, non-toxic and biodegradable. The product is completely soluble in water and it does not form any deposits in the pan or drain. Left untreated, condensate pans can suffer from the build-up of sludge, scum and other accumulations. This build-up can cause odors as well as plugged drains and overflows, which in turn result in water damage. Pan-Treat™ is formulated with ingredients proven effective in cleaning and preventing these deposits, and its use will eliminate the extra maintenance costs associated with odors, plugged drains and overflows.