3030226 Rev. D 4-23 Screen Operation And Specifications
4.5.4 Softeners
Remove calcium, magnesium, and other scale producing contaminants from the RO
feed water. Their removal prevents the build-up of scale on the membrane surface. A
control valve drives the regeneration of the softener and will remove the hardness ions
with a brine solution and rinse the ion exchange bed afterwards. The control valve is
normally governed by a semi-automatic time clock. There are three sizes of softener
tanks available.
4.5.5 Dealkalizers
Are used to lower the pH of alkaline RO feed water. Water with pH levels above 8.5
with chloramines present can reduce the performance of the carbon filters and thin-
film membranes. A control valve drives the regeneration rinsing of the dealkalizer. The
control valve is normally governed by a semi-automatic time clock. There are three sizes
of dealkalizer tanks available.
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