Once this cycle is complete, the 8 hour purge timer will reset. Power-Clean connects directly to the existing cooler pump (recirculating pump). Once installed in the pan of the cooler, Power-Clean automatically cycles every 8 hours of cooler pump operation to empty the water and replenish the cooler with fresh water. The cooler capability is never interrupted. Replacing the cooler water on a regular basis is beneficial by removing mineral scale build-up and bacterial growth. Power-Clean eliminates the need for a bleed-off and the use of cleaners or harsh chemical additives.