Q: Should I always add pond salt to my pond, or just when my fish are sick?
Ron – Whitefish Bay, WI
A: To salt or not to salt? It’s a question hotly debated by koi hobbyists. When used in low doses, salt has many health benefits for your fish – but when used in too-high doses, it can do more harm than good. Here’s what you need to know about adding salt to your pond.
Salt isn’t just for helping to heal sick fish. Constant exposure to low salt levels can improve your fishes’ overall health. It can improve gill function and oxygen uptake, reduce stress, and build a stout slime coat that’ll help them ward off parasites, bacteria and disease. Salt also adds beneficial electrolytes to the water.
The Right Type
You can’t, however, just dump a scoop of common salt, like tasty table salt or ice-melting rock salt, into the water. Fish friendly Pond Logic® Pond Salt is made from pure evaporated sea salt – and that’s it. It contains no iodine, chloride or other harsh chemicals that could harm your fish.
Just Add Salt
If you’re adding low doses of salt to your pond and have no aquatic plants, use 2½ cups of salt per 100 gallons of water and disperse the pond salt evenly around the shoreline. Salt will not evaporate or get filtered out, so the only time you need to add more salt is when you do water changes.
Mind the Plants
If you have lilies and other aquatic plants living with the fish in your water garden, use 1¼ cups of salt per 100 gallons of water. Scatter it around the shoreline, being careful to avoid direct contact with your greenery.
Fish with parasites or bacterial infections can benefit from a salt bath. Prepare an isolation tank with 5 cups of salt per 100 gallons of pond water (not tap water) and add some vigorous aeration. Place the patient in the tank for 5 to 10 minutes, and then return it to the pond.
Try adding some salt to your pond today. Your fish will thank you for the spa treatment!
Pond Talk: Have you had success treating your fishes’ disease with salt baths?