Zero-Discharge Whole-House RO System
At a large country estate in the Monterey Bay region of California, well water is used for domestic purposes at two residences and for irrigation of the grounds. Like many coastal properties, the estate suffers from a dwindling supply of freshwater and low water quality due to overuse and saltwater intrusion from the ocean.
The well water exhibited high levels of total dissolved solids, iron and manganese, resulting in scale and corrosion in the homes and staining around the grounds. The owner contracted Culligan Quality Water Enterprises Inc. (QWE) of Salinas, Calif., to resolve the issues.
Culligan QWE inspected the estate’s existing treatment systems, which included a backwashing greensand filter, ozone generator and water softener. The contractor determined that the system needed to be upgraded and integrated with a programmable logic controller (PLC) and custom software for easy remote monitoring, since the owner of the estate traveled frequently. Century Environmental Services provided the PLC integration.
The existing greensand filter was re-bedded with new media, and an ozone recirculation loop was installed on the raw water tank, where water would be transferred through the greensand filter and into two 5,000-gal storage tanks for irrigation, reverse osmosis (RO) feed and more. To address the high contaminant levels, a 6,000-gal-per-day RO system was custom built.
The project was completed in February 2011. With a master PLC to monitor water use and upgraded equipment to effectively treat and manage the well water, the property now enjoys higher water quality.