I recently purchased a 1994 C270 and was checking out the bilge. I found the bilge pump suction hose to have a piece of screening material ty-wraped over the end. With minimal debris on the screen the suction line ia almost sucked closed. I have a diaphram type bilge pump, do I really need this piece of screen? I also found screen over the end of the shower drain hose. I thought the diaphram pump could pump anything and perhaps the screens aren't necessary.Dave