Collaboration protocols with specialist companies in several sectors allow the presentation of optimized solutions suited to specific circumstances.

WATERTECH.PT – Company specializing in ultrafiltration and chemical treatment systems;
URBASER – Spanish company specializing in projects in the area of urban and industrial waste water treatment
PRESECO – Finnish company specializing in composting and anaerobic digestion;
ENRICO MAGGIO – Italian auditor specialized in the treatment of textile effluents;
INIMA – Spanish company that integrates the OHL group in the area of exploitation of wastewater treatment systems.