How many fish can call your pond home depends on the volume of the pond and the fish size. Your pond's filtration system also influences the number of fish that will thrive in a pond. A general rule of thumb is to have 1 inch of fish for every square foot in a pond that's 2 feet deep. Another rule of thumb you can follow is to have one koi fish for every 200 gallons of water or two goldfish for every 200 gallons.

Koi fish should be in the shade and can’t be directly exposed to the sun. Consider building your koi pond in a shaded spot or hanging an awning over the top to control the amount of sunlight coming in. Learn how to design a landscape properly.

Yes, natural pools can get algae since they use the same filtration processes as lakes or streams. However, you can reduce the risk of algae by adding more algae-fighting plants and not installing your natural swimming pool in direct sunlight, as it promotes algae growth.

Yes, it is possible to make a fountain without a pump, though it may seem less intuitive and will require a bit more effort to use. In lieu of an electric pump, there are a few options including hand-cranked pumps or sprinkler systems that can work to provide water for a fountain.