As far as adding Pond Salt to your pond, it is recommended that you distribute the salt around the perimeter of the pond. I also suggest making sure that you have a good idea of how many gallons your pond holds. The way I figure out gallons on a pond is to use the following formula:
(LENGTH x WIDTH x AVERAGE DEPTH) x 7.48 = Gallons
Then I deduct 15% from the total gallons as I factor in the pond is not a perfect square and that the sides are tapered. If you have pond plants in your pond, you want to use a lower dosage of salt. It is suggested that you add 1 1/4 cup of salt to every 100 gallons of pond water. If you do have pond plants in your pond, then you can increase the salt level by adding 2 1/2 cups of salt to every 100 gallons of pond water. To figure out what your pond’s salinity level is, I suggest the use of a digital salinity meter. Just to re-cap, always remember that once salt is added to your pond, it will not evaporate and cannot be filtered out by a pond filter. Only add salt when you physically do a water change and watch the amount you add!
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