Hi I have a half acre pond 7 ft deep and I've been checking my pond ph and alkalinity and in morning ph is low at around 5 and in evening it rising to about 6.6 and my
alkalinity is never over 40 usually between 20 to 40 . I know I need to add lime and have been looking at liquid lime, Calcis and Cal Flo. Have anyone had experience with any of these they seem the same. I dont have access to regular ag lime. Also trying to figure how much I need or can put at one time without upsetting the fish pond.

I've had good luck using pelletized lime. Try adding a half ton at a time.