Building a inborn swimming pool? Any body know anything about building a natural swimming pool? I...

Any body know anything about building a natural swimming pool? I want to build one but my backyard is something like a 40% slope - just wanted an model of how I could accomplish building one on a slope.
I'm in the US where most population don't know about them, so I'm pretty much on my own.
Oh - and can't I put in a falls, instead of an air pump?
What sort of plant lives on loam soil?
Answers:    Natural in appearance? Or Natural within operation/sanitation?

Your yard sounds challenging if you hold slopes up your pool can be paced near them. The front side of the pool would be commonplace elevation while the back would be built up like a wall beside the waterfall incorporated in it. If your slope go down and you have a great view not of your obstruction you can build a pool that goes the other way.

Air Pump??

If you want a innate swimming pool go for a pond with fish contained by it. There's your natural.

You're welcome!!