Microbe-Lift Pond Salt Crystals added to your pond water can be effective in helping maintain a healthy fish environment and, in proper dosages, has proven to be helpful in reducing the threat of parasitic infestations in the pond.. Microbe-Lift Pond Salt Crystals will temporarily block the toxic effects of nitrite, and, by initiating the production of a thicker slime coat on the fish's body surface, helps to promote a stronger immune system and reduce stress.