The Ezee Kleen 2.5 HD is designed for offices in geographic areas having tap water mineral levels > 100 PPM (mg/L) or offices using high volumes of water. For geographic areas having tap water mineral levels <100 PPM (mg/L) or smaller offices consider the Ezee Kleen 2.5 Distillation Alternative. Contact Oasis Dental Group Inc. for assistance in determining tap water mineral levels and the appropriate unit for your office.