Restoring settler operation and improving sludge quality in a European food processing plant with Bulab® 5828. Wastewater plant operators used to introduce ferrous sulfate as powder into the effluent treatment system from time to time in an attempt to get the sludge to settle. This treatment did not improve plant operation and there was no control regarding levels and frequency of addition. This activity cost the customer in the order of US$ 300,000 per year. See how Buckman helped.