That's great news, I'm glad you guys found something!!
We blew ours up and did a "wet" run, just to make sure we knew how long it took to inflate, how long it took to fill, and how long the water stayed warm. It aired out really quickly and I felt better knowing how the whole scene would play out. We didn't do anything to clean it out - I didn't want any soaps or any residue left behind, so basically it was just rinsed out with the water.
Emptying it was good practice too, because dh knew that was going to be his job (yuck, btw - not to gross you out too much but since he didn't get to that until the next day it was quite an unpleasant job for him. He had named it Lake FrankenStank by the time it was done)
Anyway, we left it inflated - I highly recommend this if you have room - and it took about an hour to fill... hmm, no it couldn't have been that long... maybe 40 minutes? We used a hose from the kitchen sink. It stayed warm for the entire hour that we left it set up, and I got in to soak for a bit - it was wonderful. You will love yours!
Happy waterbirthing, all of you!!!!!
(oh, p.s., If you leave it to air out outside, I would be careful that it isn't in any kind of damp location where it could pick up any mold)