A cleaning system includes a robotic cleaner and an evacuation station. The nucleic acid sequences encode threonine deaminase proteins that catalyze the conversion of threonine to \u03b1-ketobutyrate. The oval connecting block has an axis parallel to that of the blade. A small but durable hand rail mount provides for the swimmer to perform their respective workout when traveling or otherwise visiting another pool without requiring any structural modification to the pool to be used and without any concern for damage occurring to the pool to be used. The coil spring has one end including a part with a smaller winding diameter than the other portion.