Neptune Plus filters principle

Filtration. Filtration is done through a stainless steel perforated plate. When the filter screen is clogged, the pressure switch detects the pressure difference between inlet and outlet, and put on the washing cycle.

Washing. The washing is done through a back flow : the solenoid valve opens, what creates a depression which brought a back-flow of the water stocked in the hydrolic vessel. The sand-ful water is put out of the filter.