Since 1999 Environmental Equations(EE) of Austin, Texas, has been formulating and manufacturing enhanced pervious concrete additive. The attention to perfection makes EE the leader resulting with its proven additive, RainCrete®. Rain-Crete® has been formulated for convenient use with Volumetric and Ready Mix trucks. Rain-Crete® when fully cured over 4,000 psi, making it tough and strong enough for commercial vehicles yet porous enough to eliminate standing water from heavy rainfall Rain-Crete® used with our system for the elimination of retention, detention, and water quality ponds is approved by TCEQ (Texas Commission of Environmental Quality. Rain-Crete® other uses include driveways, patios, sidewalks, pool decks, sport courts, parking lots, and public roads.