For my own experience the dechlorine took less than 5 min and i start mix salt and perform water change later. Btw i am using prime. The one time that i have some condition is the sequence. I fill the pail with tap water, add prime to de chlorine. Notice water not enough so i add tap water again. Fish behave weird , hide in behind and bottom tank, i direct put prime into tank and fish normal again. Just my own experience Sent from my iPhone using Tapatalk