Problem:
My salinity probe is reading about ~29.8 while it should be closer to 35. The specific gravity of the tank water is 1.025 measured with multiple Milwaukee digital refractometers.
Trouble Shooting:
1) Cleaned probe using white distilled vinegar (full strength).
2) Calibrated using 53000 ms/cm2 solution following the instruction from Neptune. I left the calibration solution packet in the sump for a couple of hours before calibration. Probe calibrates correctly and after calibration measure about 34.9 when left in the calibration solution.
3) When I put it back in the tank, the reading settles to ~29.8
4) To ensure it's not related to any stray voltage issue (I do have a grounding cable in the main tank, not in sump), I got some tank water in a plastic container and the prob measures the same 29.8.
Background info:
1) I do BRS 2 part Calcium (200 ml/day) & Alkalinity (240 ml/day) dosing using DOS and Magnesium manually (when needed).
2) Use Tropic Marin Bio-Actif salt
3) I have a temp. probe on the pm2 module and temp. compensation is set to 2.2
I understand conductivity and specific gravity are two separate things but they don't seem to be even in the same ball park range.
Any ideas?
Thanks in advance.
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