The best a fish store can check for is the same stuff you can check for at home with a couple of test kits. Our water here in the lower mainland is pretty good so most filters have extra long life spans. J&L and Pauls (I think) sell the Tap Water Purifier, it's a DI filter that works wonders. The filter you are asking about seems to be okay. Remember a lot of what that filter is removing can be removed with a high quality carbon (which most filters use) Heavy metals, lead copper etc are the things you want to watch for but most of these can be bound with a water conditioner and removed again with carbon.
I did a quick google search on the filter and it says it removes the nasties with out the minerals in the water. I'd be cautious of it for that fact alone. It probably is an Ion Exchange filter or a simple floss/carbon system.
Buy an RO/DI unit if you want really good water, or the Tap Water Purifier will give you excellent water as well and it will last a good long time given our local water conditions.
Doug
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