I'm investigating producing a new type of porous/permeable concrete paver, but I want to get some feedback from the industry that has been using these types of pavers for years. Each paver is 1 sqft (12"x12") with a weight of 7-9lbs/paver. The installation is the same as traditional concrete paver. However, the paver comes installed with an inner core that allows water to pass through. This type of paver helps storm water management and has the potential to preprocess water passing through it to remove/contain any type of oil or liquid containments passing through it. I'm interested in knowing from everyone if there is a market for this type of product in your opinion, what competitors I should look at, and what the paver's target cost should be to be competitive with other pavers. Right now I think this paver is most like Grasscrete's Grassblock: http://www.grasscrete.com/pages/paving/grassblock.htm Thank you for your help. JOE.