1" Twin Alternating Metered Systems with pre-wired electronic controls, prefilled (12' D x 40" H) fiberglass mineral tanks with pre-assembled hub and lateral distributor, pre-assembled brine tank with grid plate, screen and brine well, and salt efficient brine valve assembly. 1 1/2" preplumbed INstallation Manifold Package with bypass valve, union and isolation ball valves. System contains 4 - mineral tanks and 2 brine tanks.