An innovative leader in the water treatment industry since 1909,
Hungerford & Terry, Inc. pioneered the Ferrosand® Continuous Regeneration "CR" Process for the removal of soluble iron and manganese from
ground water sources.
Ferrosand Filter, Ferrosand
IR for Manganese Removal
For groundwaters which contain only manganese, or manganese with lesser amounts of iron, the
Intermittent Regeneration (IR) process may be desirable. It allows for extended run lengths with a minimum amount of head loss
experienced during the filter run. In the IR process, a filter bed of Ferrosand is periodically regenerated (in a manner similar
to sodium cycle softening) with a solution of KMnO4. The frequency of regeneration is contingent upon the concentration of raw
water manganese and the volume of water treated.