Pool Cleaning Robot Backwash System and Method

A pool related platform that may include (i) a drive mechanism for moving the pool related platform; (ii) a housing that has a first fluid opening and a second fluid opening; (iii) a filtering unit that comprises a filtering element; (iv) a fluid flow mechanism for inducing a flow of fluid through the filtering unit in a first direction during a filtering process, and for inducing a flow of the fluid through the filtering element at another direction during a backwash process; (v) an entrapment cell; and (vi) a flow control unit that comprises a flow control element and an inlet that is maintained open during the filtering process and the backwash process; wherein the flow control unit is configured to allow debris and fluid from the filtering unit to enter the entrapment cell, and is configured to substantially prevent a flow of fluid and debris from the entrapment cell to the filtering unit. - 26- 1-Pool cleaning robot 6- Water outlet 2-Housing F f6-]4- Tracks 3-Wheel 5- Brush 7- Main filter chamber 6- Water outlet 8- Impeller 14- Water flow direction when 9-Pump motor in reverse, second rotational direction ("backwash" mode). 12- Entrapment cell 13- entrapment cell for backwashed dirt 10 - non-return 11- Water inlet in inlet. a first rotational direction. FIG. 2 15- Filter 16- filter screen assemblyor mesh 18-Bottom main filter cover and entrapment cell release latch. 17-Entrapment - -- )cell assembly 19-Entrapment cell opening latch.