IF I am not going to fertilize - there is NO need to add Lime (in an attempt) to increase the total alkalinity above 20. IE - if you are not going to fertilize, then total alkalinity is not a factor.
Every pond is different. Some have a tendency to have too soft water stressing fish. Some ponds don't need to be artificially fertilized but need the lime to better utilize the naturaly occuring nutrients. And then there's ones goals for the pond.
I think before I gave that advise to someone I would have to know the answer to Why are you not going to fertilize.
Pond Boss Subscriber & Books Owner
If you can read this ... thank a teacher. Since it's in english ... thank our military! Ric