In the past, the air scrubbers of INNO+ worked mainly on the basis of sulphuric acid, which is used to 'scrub' ammonia and fine dust from the air of animal sheds. The sulphuric acid made it necessary to use an expensive plastic pump. When a new bacteria-based biological air scrubber was developed, the company started looking for an alternative. This ended up being a Lowara pump from the e-SH series, which surprisingly also proved suitable for chemical scrubbers.