Hihi Vincor the right question is how BIG is his bucket I have a 6 gallon bucket which fills up a footer tank just nice. Where as I use a 0.5 gallon bucket to scoop and transfer guppies if required. So if I use the 0.5 gallon bucket I have to fill 6 buckets for 50% change which looks like alot....

OK Seriously. NewageDevil. Our storage tanks are constantly filled with new supply as and when you use the water. So it does contain some residual chlorine. Just add the antichlorine to be on the safe side. I would advise you to get the test kits. At least you would reduce the unknown factors which you have put under control.