Minder "M" series bobbin winding fiberglass top-mount sand filters.

'Minder' fiberglass sand filters are constructed by the latest engineering
technology. The improvement of flow ability provides an ultra-pure water
filtration. The fiberglass winding design allows the filter to have extra
strength and resistance to chemical and corrosives. 'Minder' fiberglass
sand filters are the most recommendable equipment for the application of
swimming pool, aquiculture and industrial water treatment.

Multi-port valve (six positions):
1) Filter (normal filtration and vacuuming)
2) Backwash (cleaning filter by reversing the flow)
3) Rinse (use after backwash to flush dirt from valve)
4) Waste (by-passes filter, used for vacuuming to waste or lowering water
level)
5) Recirculate (by-passes filter for circulating water to pool)
6) Closed (shuts off all flow to filter or pool)