I ran a SQWD for many years and can attest that they work pretty well. Sometimes, however, they will get stuck by a small grit of sand. When that happens, you can sometimes free it with a quick "whack"...but other times it requires removing the SQWD from the system and running water backwards through it.
You might find it helpful to place a couple of valves on the SQWD outputs, close to the SQWD. That way, you can close off the valves and more easily remove the SQWD for service/replacement.
I got about 2 years out them before they just wear out.
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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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