At macna 2016, I had gotten the free icp samples from aquaforest for salt and rodi water, during that time I believe icp analysis just started to issue testing for aquariums. So during my quarterly Triton test, I decided to just send all 3 test at once to see witch icp company I would be most comfortable with(and curiousity =). The results between the 3 had all came out considerably differently then one another. I spoken about this a small handfull of times Somewhere on the forum, also had to have documented this on my very lengthy build thread and was pretty upset with how it all turned out. I remember at the time I was doing comparisons between test kits, and to tell you the truth, have no idea who to believe. I'll have to go digging for the icp results, ever since then I haven't testing with a icp kit, even have 2 icp analysis tests sitting in my test kit tool box.