The Pondmaster Pressurized Filter System features a unique, manually operated agitator for dislodging over 90% of the pond residue that accumulates in the filter chamber. This patent pending feature is employed during the backwash and rinse operation. Features . Agitator unlocks waste from media saving the amount of water discharged during backwash and rinse cycles. . Unique, patent pending 3-way master valve locks into "run", "rinse", and "backwash" settings. . Clear-vue inspection port to monitor water clarity during backwash/rinse operation. . Positive pressure
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