IM Series potable water tanks from Infiltrator Systems are NSF 61 certified for potable use. Available in 552-gallon, 1,287-gallon and 1,787-gallon capacities, the injection-molded tanks feature structurally reinforced access ports, reinforced structural ribbing and fiberglass support posts for additional strength. The IM tanks are designed for buried water tank applications and require no special installation, backfill or water filling. 800/221-4436; www.infiltratorsystems.com.