Adding Salt To Your Pond
The maximum level of salt that you can run without major damage to the fish is 0.3%. This high salt level is used for treating fish wounds and parasites. To achieve this level, add 3.8 oz. of salt per 10 gallons. This salt level is better suited for a bath or in a hospital tank. Never run this high level in your main pond as it will damage the fish when used long term. Your fish will suffer from kidney damage or renal failure if this is the case.
We run our salt levels at 0.1% or lower. We never use salt to medicate any of our fish. Salt was an "old time" dip for external parasites like gill flukes. Salt in the water will not prove to be effective for 99% of the diseases you may see over time. Be careful what you are reading in internet chat rooms folks. Running high salt levels in your pond will kill your fish over time. Koi are not brackish water or marine fish, and do not require salt to survive.