Right,
We've been to many hydro pools and they all work differently. What I have found that the ones that are part of the CHA(Canine Hydrotherapy Association)
http://www.canine-hydrotherapy.org/ seemed to actually care more about the dog. Its nice for the hydrotherapist to get into the pool with the dog, but its not critical.
Any pool set up under the CHA umbrella will have to meet their requirements which normally are a lot higher than those who aren't. Also most insurance companies now will say that you need to use a pool which is CHA registered otherwise they won't pay and PetPlan are one of these companies and was with them last year when claiming for hydro.
I know my vet recommends a pool an hour away from us, when there is one closer(not by much), but they know the results which are coming back from there.
I personally would go and check out the pool first and any decent business will allow you to do so and will be welcoming of you asking questions.
Most of the pools will have a blaster and should offer this to you with a long or thick coated dog.
I would be asking your vet why they are not recommending the pool closer to you. Maybe they haven't seen good results, maybe the therapist isn't very good, maybe they aren't CHA.
http://www.canine-hydrotherapy.org/To be part of the CHA you need to of completed a particular set training course, anyone can set up a hydro business or even just a pool and not have any qualifications.
The best pool i've been to start off with the dog swimming for about 10 mins, they do this when they aren't regular swimmers and build up the time in the pool, 1 min swimming equates to 10 mins normal exercise. If you went out for a jog after not going for a while it would be silly to do too much as you'll end up injuring yourself, same is applied here.
They also checked his temp before and after the swim, rinsed him off before and after swim and blowed dried him. It was about 20-30min drive from mine, small pool, but its the quality of service and the right programme that I was looking for and I got it.
The pools not under the CHA really didn't care about the dog too much, weren't doing much for the actual problem and almost left me to deal with the dogs...

ETA: A hoist should be a requirement of the CHA!! Well it was the last time I looked :-)