A process is also disclosed for manufacturing a biological water treatment contact material made of a plurality of strips of a plastics material, which process comprises providing {TAIL ~ at least one strand} at {HEAD ~ an elevated temperature}, and applying the strand to a strip of plastic material while the strand is still at said elevated temperature 
A process is also disclosed for manufacturing a biological water treatment contact material made of a plurality of strips of a plastics material , which process comprises providing { TAIL ~ at least one strand } at { HEAD ~ an elevated temperature } , and applying the strand to a strip of plastic material while the strand is still at said elevated temperature
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