waterfall
Hi palminnie, We have a water feature that basically recirculates the same water via a pump. The movement is not enough to keep it fresh as it is the same water going round. What we do is divert the water out of the feature with the pump running--this could mean catching it in a bucket rather than let it run down the waterfall and discard this till most is gone--then fill up the water feature with fresh. Replacing at least 2/3 of the water when you notice it getting smelly is usually enough to keep it in order.
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