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I am sure this wont work because I thought it up, but I am interested from a learning stand point the whys of it not working.
Could you have a water garden pond of 5-600 gallons with nothing but plants watter lettuce hyacinths parrot feather all cleaner type plants and exchange water between the two on say a weekly basis? The water going to the koi pond would be clean the water coming back to the water garden would be packed with fish waste etc to help the plants grow?
Other than having to keep tabs on another water source to gaurd against something getting in your water garden water and getting to your koi pond what else makes this not work?
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