I didn't have a UC, but I did have a pool that I labored in...
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I was looking at all the pools - I liked the aqua doula the best, but it was SO expensive, more to rent than others were to BUY. The Aquaborn Eco is what I would've gone with if I hadn't been given a fish pool for free.
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I had my fishy pool filled for over a week, and we'd bail out cold water with a bucket (one we normally use for mopping) and then re-fill with hot water from the kitchen.... at one point when the water was pretty low, we topped off the air in the pool (didn't want to do that with a FULL pool)... I leaned on the sides a LOT... and they did okay, but it wasn't the sturdiest thing EVER... (fwiw, I weighed about 200lbs during labor)... I had thought I might want handles that are in some of the birth pools, but I didn't really end up wanting them...
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I definitely used the thermometer - at first to measure what "felt right" to me - I'd had a midwife recommend not going above 105F... I found that somewhere between 100 and 105 was about right (or start off at 105, because it would inevitably cool down.
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I bought a kit for $88 from www.waterbirthsolutions.com (they also sell pools and tarps and universal liners) that included a pump for inflation/deflation, a kitchen sink adapter, a 25' drinking water hose, thermometer, mirror, debris net, long gloves, and a submersible pump for getting the water out... I didn't need/use ALL that stuff, but it was cheaper to buy the kit than to find the things I needed individually. I also got a Y adapter from home depot so we could still use the sink without unscrewing the hose.
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hope all that info helps...