Questions before I buy a calcium reactor.

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I am looking at getting a calcium reactor for my 120 gallon mixed reef.

Up until now I have run a kalkreactor and two-part.

Here are my questions:

1. Do most people run these with or without a pH controller?

2. Do most people use a kalkreactor in addition to the calcium reactor, or not.

3. I am looking at the Barr Aquatics model 100 reactor

http://www.austinoceans.com/products...alciumreactors

because it is compact, requires no feed pump, and I like the design overall. Is there any other model that people would suggest that is available in Canada and comparable quality? I want something simple and bulletproof.