A/C condensate drain pan overflows are a very common and costly service problem. The overflows are caused by slime and sludge that builds up and clogs the drain line. The A/C Drain Sucker quickly removes the clog and excess water, resolving the overflow problem. The kit also includes PurCool Shock Tablets to clean and treat the remaining slime and sludge in the pan and lines, as well as a PurCool Pan Strip to provide months of preventive treatment and free flowing drains.