New Eco-Tek interlocking permeable concrete pavers allow water to run through gravel-filled gaps and seep into the soil. The new permeable concrete is used to create "green driveways." R.I. Lampus introduced Eco-Tek about a year ago. "We saw a trend in the market. Many municipalities are demanding stormwater management plans, and most of those other systems are much more expensive," noted Vice President Bob Welling.