Quote:
Originally Posted by @rmyvet
On the spot,
Thanks for your reply. I checked everything also when I did all the plumbing I made sure it landed in the sump and everything looks good there. I will have to check my refractometer i have the kind that you look through the small hole. Does that even get calibrated? Well i will have to check. Thanks again @rmyvet
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There should be a black plastic nub on top that can be opened, and you'll see a setscrew underneath. You can calibrate it with cal-fluid, or with RODI water, but the cal fluid will be better.