Containment Solutions, Inc. (CSI) specializes in the manufacturing of Flowtite branded underground fiberglass storage tanks (500 - 50,000 gal.) designed with non-corrosive fiberglass for safe, long term containment of septic storage. Flowtite tanks are a superior alternative to concrete because they are leak-tight and light-weight. The watertight feature of our fiberglass tanks make them the preferred storage vessel for on-site septic treatment designers and engineers. Flowtite fiberglass storage tanks contribute to satisfying multiple credits of the LEED® Green Building Rating System. Applications include rainwater harvesting, gray water reuse, sewer upgrades and landscape irrigation.