LARR/IAPMO Certified Tanks

High quality GRAF Carat S underground rainwater harvesting tanks have been tested and certified by IAPMO R&T (International Association of Plumbing & Mechanical Officials Research and Testing) to Standard Z1002 as determined by Los Angeles Research Report (LARR) 5755.

The Carat S lineup consists of four modular tank units ranging from 700 gallons to 1700 gallons which are expandable up to thousands of gallons. The precision, modular, and ultra-high strength design of the Carat S makes it the choice of professionals worldwide.