Depends on what your problem is and what's in the bottle...Wait, my problems cant be solved by something in a bottle?
Which two ICP providers did you use? How often did you repeat your test? Did you do any tests yourself to provide reference values, taken at the same time as you sampled the water for your ICP test?How do you know it was fine ? I sent 3 samples from the same tank to two different ICP providers, and none of them matched. And I sent them in the same box at the same time?
How were you able to confirm your results were accurate vs random numbers on a spreadsheet?
For the record, I don't disagree with you that the importance and efficacy of ICP is overstated, and I personally find it of limited use - it takes, on average, two weeks to get a result back from any of the more reliable ICP testers, and two weeks is plenty of time for a tank to go completely south. For testing to be truly worthwhile, it needs to give you feedback in enough time to act on its results. Even if ICP testing were 100% accurate, I would only find it useful for confirming that my home test kits were reasonably accurate.
But stating that you did ICP tests with two different providers and got shady results, and then making the leap that ALL ICP testing is useless - that's a conclusion that isn't born out by your experience. At most, you've confirmed for yourself that the two you did the test with have larger than acceptable error bars for your purposes.