The Poolcleaner  896584000020 4X Suction Pool Cleaner for Concrete Pool
SELF-ADJUSTING TURBINE VANES:  All the POOLCLEANER™ cleaners have the patented self-adjusting turbines, which maximizes the power from the water flow.  This turbine is similar to a paddle wheel with blades that are adjustable.  This feature allows the POOLCLEANER™ to still move at low suction and low pressure.  In addition, the folding vanes of the turbine allow for the easy passage of larger debris through the cleaner.                                   STEERING SYSTEM: The 2x Suction POOLCLEANER™ has an internal programmed steering system that causes the left wheel to periodically reverse, allowing the POOLCLEANER™ to turn and then move in another direction.  For the 2x Suction POOLCLEANER™, there are five different programmed turns ranging from 90 to 450 degrees.  This feature allows the POOLCLEANER™ to cover not only the deep end, but also the shallow end.  The POOLCLEANER™ has no problem with uneven surfaces or strange shapes.  It won't stick in a corner or get hung up by a main drain.                ROBUST TIRE TREADS:  One look and you will see that the patented tire treads give the POOLCLEANER™ better climbing ability and ostacle maneuverability.  The tires come with tread wear markers that show you when to replace your tires.  The front tires of the POOLCLEANER™ have humps (raised treads) that allow the POOLCLEANER™ to overcome any reasonable obstacles such as the main drain and uneven surfaces.  This makes the POOLCLEANER™ ideal for all pool surfaces and shapes.             ADJUSTABLE SKIRT:  The POOLCLEANER™ has patented adjustable skirts that allow the cleaner to maintain optimal suction under the machine even when it encounters obstacles.  When the POOLCLEANER™ encounters an obstacle, one (or more) of the skirts will lift up (adjust) over the obstacle while maintaining suction under the cleaner.