Swimming Pool to Pond

I am really in need of Robert's book. I'm wondering how we can convert a neglected swim pool to a clean pond without needing or using a pump and filter? Has anyone done this?
Blanche

A "clean" pond is essentially a balanced pond.  

The main problems with man-made and controlled ponds are caused by people trying to work against nature.
For example, a pond is not going to stay clear if it gets run off from fertilized lawns or fields.
It's not going to be healthy if it has too many fish for it's size, or not enough plants to absorb the "nutrients" created by the fish.

There is no easy answer to converting a swimming pool.  Every pond has it's own environment and characteristics to come into balance with.
You may have to deal with a "dirty" pond for a year or two after conversion until the plant life, animal life, water sources, sunlight input,etc
have a chance to balance out.  

In theory a swimming pool will work just fine, but it does have one problem. In order to control algae you want to grow plants and most swimming pools are too deep for plants, and they lack the shelves usually used for plants.

One solution is to build a biological filter beside the pond which contains the plants, but they you need a pump to push the water to the filter.

Thank you Robert and Chris for your replies. Robert, yes the plan  was to use bio filter system as I have seen many styles on youtube. But there were few who turned their pump off and are allowing nature to take course. Haven't seen end result of these and was wondering how it could turn out healthy. When I saw your book promotion, I wondered if a swim pool could actually be turned in to a natural pool without all the pumping, aeration, etc. other than with plants. I have read, however, that in order for plants to aerate, the leaves have to be in the water. Is that correct? I have seen methods of floating plants where roots are in the water, but not leaves. I have also read/heard that the plant eating fish will eat everything green...that they don't know when to stop eating. My plan was to have a pre-filter for solids and then some grow beds for growing plant fish food and other foods, and a baby fish nursery. Do plant eating fish eat baby fish also? I don't know at what size or age to put baby fish in with adult fish. Robert you mentioned the lack of shelves in swim pool conversion. Did you mean man made shelves or natural earth shelves that are formed in natural ponds? If man made shelves, what material made of and does one put the plants in pots with dirt and place in pool/pond?