Originally Posted by Eastland
I find this thread interesting. I would appreciate input regarding 2 things. 1) if a pond needed 300 lbs of alum to clear and you applied 100 lbs a month for 3 months, would it clear after the 3rd application? 2) Since Gypsum is 10X cheaper than alum, does a small treatment act like alum, or will partial results be achieved?
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If a pond needs 300lbs of Alum to clear then 300lbs needs to be applied at one time.
Gypsum has about 5-10% of the ability to flocculate and sink particulates. It is more commonly used to raise Alkalinity.

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