A water treatment company in Rotterdam Pernis had an odour problem that was noticeable as far away as Vlaardingen. After many complaints, the DCMR conducted an investigation and it turned out that this was coming from the treatment plant. CSrental installed fans here to extract the air and blow it over a carbon filter unit. This way, the smell is filtered out of the air. The DCMR environmental department then took several measurements and the situation was released to resume operations.