Alodined some of the stiffeners. The Trays worked great for this purpose. I keep the solutions in 5 gallon jugs. To drain the trays, I just hold the jug up to the drain and open the valve. When the level is low, I have to tip up the tray to get the remaining liquid out. The jug gets heavy when full, an improvement would be a hose to drain into the jug.
