BulkRate;1093126 wrote: I haven't seen any sponsors bust out the API kits in a good long while (if ever)... about every 4-6 months I have a sanity check run to make sure I'm not totally botching my Red Sea-taken readings.
Most sponsors I've used in the past couple years run the tests using Seachem, Red Sea or Sera/Nyos, with Salifert available on request. Never seen a need to pop the extra time/$ to re-run even though all have been willing to do so if there's a veracity question.
Now, as for which Sponsors do FREE testing of all the major parameters (ie salinity, Alkalinty, Nitrate, Magnesium, Calcium, Phosphate or other trace elements of interest) versus just a subset of the quicker tests? Almost none nowadays but then again they all charge so little FOR THE BATCH ($5-15) that it's usually not worth the quibbling.