Randy of course will have the definitive answer on TiO2, as well as if any of the chemicals listed are actually that problematic in reef aquaria. But from the sound of it, this doesn't sound like a necessary tool for us as a hobby. Even if you could test and accurately confirm that you had one or more of the contaminants this product was purported to remove (which I'm not sure is possible in seawater), I don't think that TiO2 is the best form of remediation. Not unless you have a very large tank. If you wanted to experiment with different media, I would try GAC and GFO first and then retest for the above compound (again, if that's even possible in seawater). It's worth noting that the aquarium hobby actually borrowed GFO from the wastewater treatment industry. GFO removes phosphate from the water because phosphorus is similar to arsenic. So the top two chemicals on that list can likely be remediated entirely by GFO alone.
How large is your tank again
@Cory? I think I remember reading it was 20 gallons. If this is the case, I'd just do three large water changes three days in a row. For example, do a 10g water change one day, another 10g change the next, and a final 10g change on the third day. That's only a 30g change total, which can be accomplished with a single 50g bag of Instant Ocean ($13USD in the States). This will remove almost 90% of all contaminants. If you do three 12g changes, this will move almost 94% of contaminants, and obviously one 20g change will remove all contaminants.
