Megalodon makes an excellent point about the TDS with regards to not knowing what those solids are. People get focused on high/low numbers & forget that even a few ppms of the wrong stuff are detrimental to your tank inhabitants. I've often mentioned on RODI related threads that people should get a water report from their utility. The utility has to provide this information, it costs nothing & even if you are using RODI system, it's still good to know what's coming in on your tap.
You mention the unit was shipped with full canisters? I assume that means there is water in them? If so, that's likely a good thing, especially for the membrane, since once a membrane is removed from it's original packaging, if it dries out, it's done. Before using the unit it would be wise to give it a good flush, perhaps replace the carbon & sediment filters & sanitize the housings. There are some pretty good instructions on how to do this on various vendor's sites like Buckeye Field Supply, Bulk Reef Supply & probably on the Spectrapure site as well. Spectrapure site should also have some instructions/specs for your particular unit, including info on restrictor location etc.
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