For this application, I'd use baking soda to raise Alk.
Use this calculator to fine tune how much you need to add, it's pretty straight forward.
http://reef.diesyst.com/flashcalc/flashcalc.html
I've used RC for the entire time I was in the hobby with absolutely no ill effects. I would get a brown film develop on the container and my pumps after mixing the salt, after reading thread after thread on what it was I just decided to ignore it. Clean the container every 6 months or so, and...
This Tunze MultiController can control up to 8 separate pumps. I used this on two Tunze 6105's with great results: $135.00
http://www.marinedepot.com/Tunze_Multicontroller_7095_External_Wavemakers_for_Aquariums-Tunze-TZ2134-FIWMEW-vi.html
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