Just received and unpackaged my new Dolphin Nautilus robotic pool cleaner. My question to other owners of this model (or similar Dolphins) is regarding two decent-sized block pieces of styrofoam inside the unit where the filter screens and drive motor are. Should these things be removed? Are they there for shipping purposes and protection only.....or part of the machine's workings? That whole area would be submerged in water when the machine is in the water and I can't imagine that styrofoam would last in the pools chemical water environment. Anyone else seen or dealt with this "issue"? I'd call the company and ask, but of course they are closed and I really want to start using the cleaner today.