See if their equipment looks well-maintained or old and beat up. Their equipment is a representation of their company and how they clean. Make sure their filtration unit is big enough for a cleaning of a parking structure as well. Most garages of 300,000 square feet will have more than 50 to 300 gallons of sludge. If their filtration unit has a capacity of 60 gallons, then most likely it is undersized for the job.
Reducing humanity's impact WWF is working to reduce humanity's ecological footprint â the amount of land and natural resources needed to supply our food, water, fibre and timber, and to absorb our CO 2 emissions. Subscribe to WWF
What Is the Ecological Footprint? The Ecological Footprint is rooted in the fact that all renewable resources come from the earth. It accounts for the flows of energy and matter to and from any defined economy and converts these into the corresponding land/water area required for nature to support these flows.