What about insects and fish?

The organic system of a natural pond relies on bio-diversity to keep the water clean, inviting everything from microscopic pond organisms to water beetles and larger animals like frogs. However, these creatures are attracted to the regeneration zone and will largely stay out of the main swimming area. Fish will not naturally appear in your pool; however, some pools can support a small number of fish in the swimming area (not the regeneration zone). Please discuss this with your pool designer if you are interested in this.