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I use a LMIII. From a 100 SW tank it doses 7 gallons to my display, then takes 6 gallons to my prop system, Then from my prop to the sink. I usually go thru 1.5 gallons of skimmate a day so in a 600 gallon total system the salinity stays pretty constant. Its a total of about 200 gallons a month or 33%. With the two sulfer denitrators my nitrates hang around 2-4ppm which is where I like them. So the constant waterchange isn't to battle nitrates which would probably be more efficient to do one or two big changes a month, its more for beneficial trace elements.
The evap is handled by a Tunze Osmolator which is pumped to two solenoids. Depending on the PH of the tank it goes to either kalk reactor or straight to the tank. It helps keep the PH pretty stable, not really sure if it matters or not but I like stability in the system.
By the way nice tank Robz... I hope to have colonies that big and nice in the future!!
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