- Joined
- Oct 28, 2018
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- What state or country do you live in
- New York
Why not just Saltwater for your top off until the salinity gradually increases?
PS - So now you have 2 tests that agree with each other (the 1 refractometer and the Hanna) and the (second refractometer and the apex) - so how do you know which 'two' are correct. Before you jump into rapidly changing anything - IMO you should get the calibration solution for the apex - calibrate both refractometers - and double check the Hanna with a known solution as well.
Then recheck - if everything in your tank is fine - there is no reason to rapidly increase the salinity.
I understand your point not to rush up into conclusion, the Hanna is purchased just to deal with this and find out which gives correct salinity, I don't fully trust apex reading. I also did test with a friends refractometer and then came to conclusion that apex is off and my cheap refractometer is not calibrated.


