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Many of the angles were removed and replaced with more gradual curves in the pipe layout, allowing the water from the pond to move more freely and filter properly.
At first glance, plumbing a koi pond — a backyard body of water stocked with colorful fish — looks simple. You connect the pond, bottom drain(s), skimmer and filters together using pipes and pumps into a continuous closed loop system — just as you would a swimming pool.
Except,...
