re: Natural Pools - the next backyard project

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There's got to be some amount of chemicals right?

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I'm sure you have to add something. I have live plants in my aquarium and once they got healthy the aquarium was really easy to maintain. Just have to add an algicide here and there.
Had a Koi pond pre-K and it wasn't hard to keep clear, and the fish ate the mosquitoes and tadpoles. But I don't see how mosquitoes and larvae wouldn't be a huge problem without chemicals or fish.