 As the heated seawater called brine has a particularly corrosive effect, excellent corrosion resistant yet heat conducting materials (like Titanium) have to be used for such systems.Due to the large tube diameters in the evaporators, the cleaning balls have diameters of up to 45 mm.In the 1970s, the product range was extended by backwash filters to protect the heat exchangers and condensers from macro fouling, like stones, pieces of wood, fibres, plastic sheeting, and mussels.