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Akai-san, I'd increase the turnover rate on the pond.
Pull the bottom drain water into the Nexus units after the 42" vortex units and use the 'static K1' option for the Nexus units. That'll be one set.
Pull the mid-water into another set of 42" vortex, this time with brushes, and then to the showers.
Both sets can use very high efficiency pumps; maybe Wave I 1/4hp? That should get you about 10000gph pretty easily for about 6 amps...
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