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You can convert a swimming pool into a fish pond. All you need is to have a fish pond filter, and maybe some cover for the pool.
The filter system is mandatory for keeping the ammonia and nitrite at 0ppm for the pond. There are some such filters for sale on Amazon.com. A few models are made to look like a fountain which is perfect for a fish pond.
One majority problem with the outdoor pond is that it can easily be overrun by algae since it usually gets a lot of sunlight exposure. Too much light always translate to too much algae. It is the best to have something over it, like a large tree or maybe build a bridge or other structures over it.
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