GreensandPlus Filtration Technology from Inversand Exceeds Water Purification Standards for Water Utility
Clayton, NJ – A pilot test of GreensandPlus from Inversand Company as pretreatment to an existing RO plant at a Western U.S. water utility demonstrated a dramatic reduction iron and manganese in the raw water to levels below 15 μg/L. The negative effect the iron and manganese was causing in the treatment process was eliminated. The GreensandPlus filter achieved these results operating at flux rates of up to 8 gallons per minute per square foot.
Prior to the application of the GreensandPlus, an iron silicate was being formed in the RO vessel at the existing plant, thus fouling the membranes. The iron was below the MCL for potable water, but was high enough to cause fouling in the presence of the silica.
The raw water had 0.25 mg/L average iron and 0.023 mg/L average manganese. To correct the problem, the manufacturer of the membranes recommended reduction of the iron and manganese in the raw water to less 15 μg/L (15 ppb) for each constituent.