from thereHow to administer
There are many "Rule of Thumb" guidelines for how much salt to add. Either, 1 tablespoon per 5 gallons, 1 tbsp/10 gallons, etc... If this has worked for you in the past, fine. I have always dosed my tanks at 0.3% (3 tsp/gallon) when needed, which is considerably higher than many suggest. Only exception to this rule is for nitrite poisoning where a teaspoon of salt will treat over 300 gallons of water. Many believe that the constant use of salt in low dosages is the reason why we are having problems with salt resistant parasites. And as a result, some parasitic infestations need to double the dosage to 0.6% to see any significant improvement.