So what is the true cost of your tank liner? Sure there is the initial cost of the liner itself but what about the cost of your liner over its service life?
Hard chrome plating solutions are notorious for breaking down tank liners at the area where solution and oxygen interact. This is because as the solution evaporates the fumes condensate back on the liner. That condensate is now at a concentration of chrome beyond which PVC can handle. This causes the liner to break down at this area while the rest of the liner that is under solution still has years of service life left.