Great, thanks for the info. One more thing while I'm thinking about it if you don't mind. The fine filter on this machine is donut shaped and just below the lower spray arm. It is connected to a rubber tube which is part of the sump. That tube leads to the discharge side of the drain pump. So what does that fine filter actually do? Looks like when the drain pump operates it would push water up through the fine filter. Besides this connection, the fine filter is otherwise closed. Thanks.