I suspect locals are talking of not liming a pond due to higher pH soils. But I would suspect that's not the case when one adds an acid to the water. You could run a pilot test. Take pond water sample, like 5 gals, add the alum ck pH before and after. Add lime and or soda ash and check for pH increase. Another thing is when adding lime your water hardness and or calcium should come up. Soda ash will lower water hardness/calcium. Fish need the water to have some water hardness/calcium but I don't recall what the water hardness/calcium ppm needs to be, but maybe someone else will jump in here.
Do not judge me by the politicians in my City, State or Federal Government.
