Salinity keeps dropping ???

[Mele__Reef]

3 gallon pico reef tank all water parameters are in the green. But salinity is always dropping from 1.024-1.019 I do have an auto top off with kalk2 mix contains ( calcium, mag.,and stronite.) is there a better way to control this?
Thanks

 

[Shep]

The only thing I can think of is that your ATO adds too much top off water, which drops the salinity. What ATO do you have?

 

[Doob]

Or you have an inaccurate testing device. Refractometer?

 

[Mele__Reef]

@Shep that's a good point. @Doob I think that might also be my problem. I am currently using a hydrometer. What is a refractometer that you recommend?

 

[zeeGGee]

how much water you
have to top off everyday?

 

[jsker]

Here you go https://www.amazon.com/Deepwater-Aq..._5?s=industrial&ie=UTF8&qid=1467687890&sr=1-5

 

[Doob]

I have this one. 10% off right now and comes with calibration fluid.

http://www.bulkreefsupply.com/refractometer-for-reading-salinity-with-calibration-fluid.html