Swimming with A Stretch Cord

I have access to a small pool, and was considering doing some of my swim training using one of those “strech cords” whereby you strap yourself (i.e. either your waist or your ankles) with a cord and the other end is strapped to a fixed object.

Does anyone use these types of devices to train in a small pool? If so, any thoughts on the types that strap to the waist as opposed to the ankle?

I believe this was posted before by (I think) tri_bri2. Do a goggle and you might find the post.

Thanks for the heads-up Cerveloguy. I found the post and a discussion on a Riptide system. It goes for $70 and is an interesting looking device (see swimriptide.com). Naturally my next question is has anyone purchased and used it???

I would be interested too since our neighborhood pool is right across the street from my house.