The Pure ES is a steam humidifier designed to be attached to either a steam nozzle or a small blower system. Twice per year maintenance on the Pure ES humidifier consists of washing out the water basin to remove scale buildup. We stock all the available parts for the Pure ES series humidifiers. The ES Series Humidifier utilizes a Tri-Probe conductive type water control system, which is designed for use with standard (hard or soft) tap water. Use of demineralized, deionized or reverse osmosis water will cause a failure of the water level control system and void the warranty.