Can anyone tell me how effective salt is in the treatment of Ich when used in the aquaponics system. Does it permanently rid Ich from the system? From some of the threads I've read, the recommended dose is 3ppt for a period of about 3 weeks. I can't find any information anywhere on how the salt actually rids this parasite. At what stage of the ich cycle is it effective? Is it when it's attached to the fish (Trophozoite) or when free swimming as a Trophont or the infectious stage as Tomites. Does using salt in the system at a reduced rate (1ppt as fish health tonic) give the Ich some immunity when a higher dose has to be used? Does anyone have any views from their experience?