I have four 5 gallon buckets, I fill 3 of them right when I get home from work at 4 with warm water and conditioner and let them sit on the counter untill the kids go to bed and I have some free time. Then I use the vacuum to take water out into the 4th bucket and carry it outside and water my flowers with it, 3 trips outside later and then the fresh water goes back in, I am lucky enough to have my tank right next to our entertainment center so I can sit the buckets on top of that to siphon back in. I use the gravel vac to siphon it back into the tank, usually takes about 7-9 minutes per bucket to get them siphoned into the tank.