The construction of this koi pond features a 150 gallon upper pond that feeds a stream that waterfalls into a 1400 gallon lower pond that is 3 feet deep. In the building of this koi pond we used a Tetra PUV2500 to filter the pond against algae using untraviolet light (uv) and to biologically filter the fish waste. The design of this system utilizes a bottom drain and an under water pond return (TPR) to give a nice ripple effect as the filtered water re-enters the pond.
