I would start with 300# per acre foot of water and then test the pH an hour later. That is not to raise it 1 point, that is to raise it to 11, which is toxic to fish.
To do a test, get some hydrated lime and get pond water and a pH meter. 100 mg Hydrated Lime per liter of water should raise it close to 11. Double check to be sure, then do the math to see how much you need to buy.
Last edited by esshup; 12/12/20 01:49 PM.
