Salinity issue

[DTz]

Hey guys, I recently did a tank upgrade and moved my old water to a fiber tank. My new 9 feet tank is finally set up, so I did a salinity check on my fiber tanks water. All good at 35 ppt. I start pumping the water in my tank which consist of just rocks and sand. While filling I test the water in my new tank and the reading came out at 26ppt. May I know what’s causing the drop in salinity? Any experience this before?

 

[ryanjohn1]

What are you using to check with. Did it loose calibration potentially between tank to tank

 

[Randy Holmes-Farley]

Unless the new tank was 1/4 full of fresh water before adding the old water, then one or both of the values is incorrect.

 

[Gumbies R Us]

I would double check your calibration