Answer
How do you keep pond water clear without chemicals?
Through a balanced ecosystem: planting, filtration, circulation and beneficial bacteria, not chemicals.
In short
Through balance, not chemicals. A planted regeneration zone, the right filtration and circulation, and rock and gravel that host beneficial bacteria all work together so the biology keeps the water clear. That balance is the point of an ecosystem pond, and what a Certified Aquascape Contractor is trained to build.
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