4.3k+ gals pond with two koi toilet bottom drain. skimmer, mid-level intake, 150 gals settling tank. 6k ultimate bead filter for pre-filter, two 40watts UV in series, then fed to 250 gals matala bio chamber for waterfall. de-gas with six 8 inches stones by AL-60 air pump. took 6 months to build the darn thing.
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