That dosing pump does sound very nice, but I'm not sure you'll have a lot of luck using for evaporation replacement.
When I first setup an evaporative replacement system, I tried to use a peristaltic pump, figuring that I could dial in the exact amount of evaporation. What I learned, was that I was always wrong. One day, too much..the next...too little.
Evaporation isn't constant. It changes based on environmental humidity and temperature. In the end, I changed over to a float switch based system and it worked better.
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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank: http://www.canreef.com/vbulletin/showthread.php?t=28436
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