I dont use the attachment Hubby made for me to go onto the Tap, for Water Changes, meaning taking the Water out of the Tank, always use my Gravel Vac for that, only use the Hose that attaches straight onto the Tap for refilling my Tank
I'm sure using The Sypnoner that attaches onto the Tap, is fine if you are only wanting to take water out and put water back into your tank, no good if you are wanting to vaccum the gravel.
I have 7 Discus so I like to Gravel Vac with every water change I do, which is every second day now, as I have asdded a few more Discus to my Tank :bounce: :bounce: