A smaller tank you can add it to the bucket of water before you add it to the tank. I add it as I fill tanks with a hose, it doesn't make a difference to the fish. Prolonged exposure to chlorine & chloramines burns gills and kills off the bacteria in the filter. Seeing as dechlorinator works nearly instantly, I add it in every 10 gallons in larger tanks, 5 gallons in smaller. I would be taking way too much time using buckets to do 200+ gallons a week.
Tolak