How do I measure above 1500 on Salifert?

[Tom Toro]

How do I measure above 1500 on Salifert?
My Salifert test only goes up to 1500. I'd like to kick it up to 1800 to get rid of my bryopsis. Is there someway I can do this with Salifert or do I need to get a different tester?
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[jimsflies]

I think you could dilute your sample with a known amount of RO water. Say run your test with 75% tank water and 25% RO. Then the final answer will have to be multiplied by 1.33 to get the correct answer.

[Tom Toro]

Thanks Jim. I'll need the calculator for sure. :big_grin: