actually no, that is incorrect. Acidity is caused by decaying organic matter or if your source water is already acidic. Over time, most ponds become more acidic for the above reason. Proper Kh and Gh numbers will keep the ph (ph is a measure of acid/base solutions) balanced, but you'd need to test your water first. The reason most keep their water/pump moving is to help alleviate the effect of ice on the surface and/or to keep a hole open. Many don't have any water movement at all (or, very little) but create the same effect with either aerators/deicers/or pond breathers. You have to be careful that if you have a waterfall, that it doesn't freeze and divert water out of your pond (in the winter).I leave my pump on all winter. I was told to do this as the water would become very acidic if I switched it off! Was this correct?
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