Chad, you shouldn't really need to if you are using a quality salt mix.
Regarding DI water from Aquarium Pharmacueticals site:
Quote:
Do I need to use Electro-Right and pH Adjuster when making saltwater?
No. Your synthetic saltwater mix should contain all the buffers, electrolytes and trace elements necessary for the aquarium. You can add special marine buffers like proper pH 8.2, and trace elements, in the aquarium later. When topping off the aquarium it is not necessary to use Electro-Right and pH Adjuster.
When I make saltwater water the pH never stabilizes to 8.2-8.4. Does deionized water lower pH?
No. Deionized water has no pH adjusting properties. The pH of your marine aquarium is regulated primarily by the buffer system created by the synthetic sea salts. If the salt manufacturer does not properly blend in the buffer salts, the final solution will have a pH other than 8.2-8.4. Some synthetic sea salts consistently run "low" or "high" depending on the manufacturer’s formula and blending techniques. Tap water may contain a significant amount of carbonate hardness (KH), which boosts the pH of "low pH sea salts". When you start using pure water, you might need to use a pH buffering product to raise the KH of the saltwater and increase the pH.
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Kent RO Right is a freshwater product.