Are you talking about
adv. aquarists' study?
If so, it didn't test for the things we care most about, no test for ca/alk/mag/nitrate/phosphate/etc. They focused on heavy metals like barium, nickel, titanium, etc.
There was one other
study that did test ca, but that was done about 10 years ago and didn't include popular salts like Oceanic, not sure how relevant that is to today's salt...
aquariumwatertesting tests for:
- Ammonia
- Nitrite
- Nitrate
- Phosphate
- Silica
- Alkalinity
- Calcium
- Potassium
- Magnesium
- Strontium
- Molybdenum
- Iodine
- Copper
- Boron
using spectrophotometry, auto-titration, and specialized ion specific probes to deliver a level of accuracy 100 to 1000 times greater than that of home testing procedures.
Sample report.