Well just talked to my
LFS family owned and operated. trust very much as they go with fishless cycling and the one inch rule. and will even ask you to bring in your water for testing before they will sell to you. they also will ask you what size tank you have and whats in it and not let you buy a fish that is unsuitable for the tank.
that said, they will not even sell that type of syphon that attaches to the sink because you can not treat the water before it enters the tank.
the idea he gave me so that i dont break my back with water changes is to fill an empty trash can next to my tank and treat it then syphon it into the tank.