Significantly increases pump life, if you choose constant pump working cycle rather than intermittent cycle. This would eliminate the need for level or timer. Keep in mind that the pump will last 2-4 times printed warranty period.
It is usually not necessary to have a foam filter for submersible pumps, as the display cover is more than enough. Chances are that the foam filter will clog the pump quickly. Micro-algae are also a concern, but not a problem if the water flow is affected. Keep these points in mind and be sure to get more information online before choosing the perfect pump.