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 at least one strand at an elevated temperature, and applying {HEAD ~ the strand} to {TAIL ~ a strip} of plastic material while the strand is still at said elevated temperature 
to
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 at least one strand at an elevated temperature , and applying { HEAD ~ the strand } to { TAIL ~ a strip } of plastic material while the strand is still at said elevated temperature
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