I have a 2nd sump dedicated to water changes. When I want to change, I shut off flow into/out of this sump, marking the level of the water in this sump (25 gallons). The main sump and tank continue to run normally.
I open the drain valve on the 2nd sump and the sump empties. I use a rag to wipe the sump clean of any "stuff".
Meanwhile, new SW has been mixed in advance in a 50 gallon mixer. A quick throw of a valve and the mixer pumps new SW into the empty sump.
Total time: 5 minutes. (4 of those are because the drain valve is slow to drain the sump!)
Right now, I'm not heating the new water. I just let it enter the system cold.
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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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