Many facilities incorporate pretreatment equipment, upstream of the RO treatment system.
Here is an example of a designed filter system that offers protection to the RO membranes. The filters are sized to treat a flow of 3,576 gpm and remove 3 mg/L of iron and 0.06 mg/L of manganese. Hungerford & Terry’s system includes four (4) 10’ diameter x 30’ long 2-cell horizontal filters and a custom forced draft degasifier to reduce 50 mg/L of CO2 in the RO effluent to 8 mg/L. The degasifier is housed in the silo portion of the farm building and includes a 12’ diameter x 16’ tall FRP tower with 905 ft3 of polypropylene tower packing, plus a 16,900 cfm air blower. This unique system is one of many H&T filter systems that currently pretreat water for RO/other membrane type treatment operations around the world.