This function is performed by an automatic, self-cleaning screen filter. The uniqueness of the filter is its automatic suction system for cleaning the screen.

Incoming water enters the screen filter, passing through a fine screen and on to the outlet port. Sediments that are trapped on the screen create a “cake” of sediment. This “cake” helps to improve filtration efficiency because it serves as a finer filter. The automatic flushing process starts whenever the pressure between the inlet and the outlet of the filter reaches a predetermined differential that lasts for 10 seconds. Inline water pressure controls this operation without interfering with the filtration process.

The automatic screen cleaning process is short and efficient, saving water and time, while leaving the screen clean.

A coagulant is mixed with incoming water. The unit includes a tank, dosing pump and cyclone mixer for improved mixture of coagulants with the water.

This process allows for capturing very small debris by coagulating the microscopic particles into larger particles called “floc”. The floc particles are then filtered by passing the water through the layered beds of granular media.

Alum is a commonly-used coagulant but other options such as aluminum chlorohydrate, calcium oxide, iron chloride, iron sulfate, sodium aluminate, sodium silicate may be used.

During filter backwash, water flow is reversed and sent up into the filters’ media beds, fluidizing the media layers and causing a turbulent expansion of the media. This action effectively flushes any debris from the media bed. The debris from the media layers is carried out to the drain through the backwash outlet valve.

The backwash process occurs in one media filter at a time, allowing for filtered water from the other three filters to be used. The filtered water enters through the outlet/backwash manifold. In this stage, the backwashed filter inlet/backwash outlet valve is closed to inlet and open to backwash outlet.

The four multi-media filters use a combination of media layers of basalt, quartz sand and anthracite to remove suspended organic matter and inorganic particles from the water.

The multi-media filters have a total media height of 40” in each filter and employ a unique design of a double-bottom chamber separated by a reinforced steel plate. The upper chamber contains the layers of media and the lower chamber collects the filtered water after it has flowed through the media. The separation plate is covered by slotted, conical “mushroom” diffusers. These diffusers allow the filtered water to flow into the bottom of the tank as well as acting as the “nozzles” during backwash. The diffusers help eliminate channeling and caking of debris by delivering a uniform dispersion of water throughout the entire media bed during the backwash cycle, providing an effective wash of the media layers while using a minimum volume of water.

A direct wash is performed automatically in all four filters at the same time immediately following the backwash. This operation helps resettle the media into layers so the filtration process can resume.

Water enters the filters through inlet/backwash outlet valves, (valves are open to inlet and closed to backwash outlet), exits the filters from the drain manifold in the bottom of the filters and flows out through the drain valve.

Flocculation: Flocculants remove colloidal particles from the effluent to improve the permeate quality. They also assist in reducing phosphorus levels in the water. This option increases the collective capacity of the system and is recommended where maximum particle removal is desired.

This option includes a tank, dosing pump and cyclone mixer.

Alum is a commonly-used coagulant but other options such as aluminum chlorohydrate, calcium oxide, iron chloride, iron sulfate, sodium aluminate, sodium silicate may be used.

While no claims regarding phosphorus levels are made, coagulants such as alum do have a positive effect on phosphorus reduction.

Chlorine Dosing*: Automated dosing of hypochlorite/chlorine gas to destroy pathogens and micro-organisms in the treated water.

Free Chlorine Monitoring: This fully automatic option integrates with the chlorine dosing option and provides for additional dosing control as well as residual chlorine monitoring and readout.

Turbidity Management: Turbidity can be reduced to 5 ntu with this option. The entire filtration process is constantly monitored and automatic adjustments are made to deliver the desired clarity of water. The Flocculation option must be added with Turbidity Management for optimum results.