Water Quality Requirements for Misting System

Due to the extremely small orifice of the mist nozzles, the misting system has strict requirements for water quality, otherwise, the nozzles are easily blocked. The water must be treated by RO system to remove contaminants, such as salt, calcium, aluminum, magnesium, etc, which function as electrolytes and can result in severe corrosion of nozzles.

The system shall use water which meets the manufactures requirements. As a minimum the water shall meet the following requirements:

• Equivalent of a potable water supply
• Colorless and odorless
• Non corrosive
• Chloride concentration < 50ppm (=50mg/l)
• pH value 7.0 – 9.0
• Iron (Fe) and Manganese (mN); sum < 0.3mg/l
• No free chlorine

It is best to use three-stage filtration:

• First-stage: filtration uses polyphosphate filters to soften hard water.
• Second-stage: filtration uses 15 micron PP filter, filtering impurities above 15 microns.
• Three-stage: filtering impurities above 5 microns.

For RELAB's fine mist nozzles, normally we use a 10~15 micron filter plug, such as FF, FE, FG and FJ series.