I. Kruger Inc., a Veolia Water Solutions & Technologies company, supplied the Montezuma Water Company (MWC) with an ACTIFLO process plant designed to treat four (4) million gallons per day, which began operations in 1999. The raw water consists of surface water including mountain run-off which travels from the Dolores River into Lake McPhee. From here the water is collected and distributed to the MWC Treatment Plant where it is treated to drinking water standards for public use.

Kruger worked with the client's engineer (Integra Engineering) on the design, evaluation, and selection phases of the project. The ultimate goal was for MWC to have the capability of keeping up with high turbidity events. Kruger's ACTIFLO system was selected to replace the plant's existing adsorption clarifiers. The ACTIFLO process was chosen as the preferred process due to its ability to allow the plant to remain on line during periods of high turbidity and to consistently produce a higher quality of water meeting current needs. The ACTIFLO process also allows MWC to meet the requirements of the future in regards to the new safe drinking laws.

According to Conrad Hoover the plant superintendent, the plant experienced their "worst run-off season in history in 2005" with turbidity as high as 375 NTU and a settled turbidity from the ACTIFLO process of < 2.0 NTU with only a slight increase in coagulant (Alum) to 40 mg/l. Mountain run-off is considered one of the most difficult source waters to treat; however the ACTIFLO process has been proven to treat these challenging applications with turbidities reaching into the thousands regardless of the cold water affects. Conrad also stated that "filter runs range between 46 to 80 hours between backwash" depending on what type of filter system is utilized.

The ACTIFLO Process is a proven, high performance, compact clarification system that utilizes micro-sand enhanced flocculation and settling. A coagulant is added to the raw water for destabilization of the colloids. The coagulated water then goes through a two-stage flocculation where micro-sand and polymer are added. The destabilized suspended solids bind to the micro-sand particles through polymer bridges creating extremely dense floc particles, which have excellent settling characteristics. The water then travels through different sets of multi-media filters where sub-micron particulate matter is removed.