if anyone wanna use anything for instant cycle, I would only recommend Fritz Turbostart 900. We have tested it over and over again on almost daily basis on our commercial setups. We bleach systems and dry them next day add water and dose Fritz and add fish rightaway. Dose Fritz 2nd day and then after a week and thats it. Ours is commercial setup, at home you can likely get away with 1 initial dose and 1 a couple of days later.