Was your pond in immediate danger? What exactly was you helping by doing this. Just curious never give alkalinity much thought.
No danger but near the needs point.
In many southern waters the soil (and ponds) are acidic (alkalinity below 25). Plankton does not bloom /grow well in acidic ponds thus knocking the base out from under the food chain/web. Also higher alkalinity (over 20) helps reduce wide daily ph swings which stress fish. Most common pond fish have an optimum alkalinity range around 200. Many places have good alkalinity and never need to add ag lime.
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