I made a 25" (64cm) hoop made from PVC plumbing parts. Pictures show progressively how I made the hoop and wrapped it with a wide knit yarn. The hoop has a shoulder-height pole of PVC with a 45-degree bend just before the union, which attaches the pole to the hoop. I will make a shorter handle as well, but since I am getting old and my knees hurt, I think I will probably prefer not to bend over anyway.
The finished hoop fits into a water heater drain pan from Lowes, in the USA, that is 26" (66cm) in diameter. The pan includes a 1.5" (3.8cm) large pre-punched hole. The pan is sold with a male threaded adapter, rubber washer, and large nut to attach the adapter to the pan. I found that Lowes' blue 1.5" (3.8cm) swimming pool flat drain hose fits right over the adapter, so I slipped the hose halfway over the adapter and secured it with duct tape. I can roll up the hose and clip it with a large secretarial clip. I made the flat hose long enough that I could put it into the 5-gallon jug BEFORE I lift the pan to drain it.
WIKI NOTE: The author (Grandpop Bubbles) has posted his instructions on a different wiki (click here). Hopefully, a full copy of the article will appear over here on the Soapbubble Wiki.