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If you tested your source (fresh) water, then you can be sure it's within hanna stated uncertainty.Well, I got my Hanna Silica LR in and to my surprise my source water is 0.34ppm silica (took 2 readings 0.37 and 0.31). Tank reading 0.20-0.21. Which would explain the abundance of sponges in my sump.
That being said what are good alternatives (within $ reason) for Si test kits? Talking to Hanna, they don't advise using their kit on saltwater and can't guarantee the accuracy of the result. What is everyone using?
Hanna doesn't recommend for saltwater probably because it has more than their stated 5% uncertainty or whatever. It still is very consistent and far more accurate than other hobby kits.
(I'll poke around and see if I have a calibration curve somewhere, it comes out to be like a 10% under-measurement in tank water I think)
If you want to upgrade, you can use the kit from hach that Randy recommends and wrote up in his article on Si.