One thing I've read about the film and proper wetting with tubes, there is fiberglass window screen made which you can buy at any hardware store in bulk. You can cut it with regular scissors easily. There is a recommendation for cutting screen which is slightly longer than the film itself, so you can grasp the edge of the screen to pull out the film. This is easier because handling of the film is reduced and removing the screen pulls the film with it. The solution is able to circulate more readily behind the film for proper wetting of both sides..