I run both my Ca reactor and my Kalk reactor on peristaltic pumps and would not do it any other way. The reactor can be very precisely controlled this way.
The pump was supplied by Omega. I bought the FPU115 which is rated at 115ml/min, and I'm currently running it on for 1 minute, off for 1 minute. My controller cycles the pump using a simple timer program, controlled to the second. (most commonly used for wave function).
Here's a link to their website.
http://www.omega.ca/shop/pptsc.asp?r...100&Nav=grel07
So far, these pumps have worked for over 4 years now without a hiccup.
PS. If Omego won't sell directly to you, send me a PM and I'll purchase it for you.
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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