Hello again, Mlh1,
I hope the fish are okay, as freezing can alter the product and make it toxic to the fish. You would definitely want to do a partial water change, and I would wait at least a few days, if not a whole week. Yes, pond salt is good to add at a rate of 1 lb per 100 gallons of water for ponds with fish and plants. Add 1.25 lbs per 100 gallons for ponds with fish only.
Date published: 2017-06-08