The filter station Modrac was built in 1969 based on an Ansaldo-Italy license.
The main goal of the plant is the production of:
– decarbonized water for the technological needs of the plant (using limestone milk as a softener and aluminium sulphate as flocculents)
– Water for sanitary needs of the city (water from wells)
The decarbonisation unit has three lines with a capacity of 350 m³/s each. The process consists of the following activities:
– Adding limestone milk to crude water to eliminate carbonates. This process reduces water hardness (preventing incrustations in pipelines)
– Adding aluminium sulphate to bind flocculants to accelerate sludge settling
– Sludge decantation
-Water filtration (sand filters).
The water production system for sanitary needs has a capacity of 5000-6000 m³/day. It contains 17 wells, a water disinfection unit (NAHOCl) and a pumping station.