Check Valves are an essential part of a healthy biological filter package for any pond. In the event of a pump shut-off, the check valve keeps sufficient water inside the filter to keep the beneficial bacteria alive, keeping the ecology of the pond healthy and effective for reducing sludge, nitrates and ammonia. Check valves are also an important part of a pond-less waterfall feature - in the event of a pump shut-off the check valve holds water in the piping to prevent the basin from overflowing.
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