ahhh! I didn't notice that we live in different parts of the country. Well the stores involved are actually the ones that sponsor this site. Aquarium illusions looked at me like I was crazy and asked with the DI in RO/DI meant and Blue World pointed to the one on their wall and said rather unequivocally "waste of money".
The multi pad is mostly there to filter out any heavy metals that might have somehow leached in through the pipes. So it filters out copper, lead and other heavy metals but does have some carbon.
I have a feeling that the need for RO/DI is heavily dependent on your local water conditions. I have always wondered if our water quality in Edmonton is one of the explanations for the rather stunning number of speciality fish stores in the city. Maybe people are just more successful in the hobby here because of the water quality?
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