Making salt water

[Joshifer]

Ok I finally got it to match my tank 1.025

 

Is the SG in this mix gonna move if left over night?

 

Or is it gonna stay there?

 

Theirs a 500gph PH heater and air stone in there. Thanks

Edited September 6, 2013 by Joshifer

[MBVette]

It won't move if there is no more salt in the container to dissolve into the water.

[countryboy]

Mine generally raises when it sits. I let it set all day or overnight then check again

[lnevo]

If you keep it covered to prevent evaporation, it should stay put.

[zygote2k]

It won't move if there is no more salt in the container to dissolve into the water.

+1

[Joshifer]

Thanks. I'll check it I'm a few hours when I get home

[lutz123]

I can't remember what the relationship is, but makesure you are testing salinity/specific gravity at your tank temperature. I believe (but am not sure) that you get a different reading on a hydrometer at 70 degrees vs. 80 degrees.

[Origami]

I can't remember what the relationship is, but makesure you are testing salinity/specific gravity at your tank temperature. I believe (but am not sure) that you get a different reading on a hydrometer at 70 degrees vs. 80 degrees.

Floating hydrometers generally need temperature correction. Believe it or not, the cheaper, more common swing arm hydrometers do not and are still reasonably accurate. Here's one reference. Just make sure that you get the bubbles off of the swing arm which may result in a bad reading. Also, if the little counterweight on the swing arm ever drops off, throw the hydrometer away. From time to time, check your hydrometer against a calibrated refractometer or against a known standard, to ensure it's performing well.

[paul b]

 Believe it or not, the cheaper, more common swing arm hydrometers do not and are still reasonably accurate. Here's one reference.

 

That's what I use, state of the art in the 70s

[Joshifer]

Floating hydrometers generally need temperature correction. Believe it or not, the cheaper, more common swing arm hydrometers do not and are still reasonably accurate. Here's one reference. Just make sure that you get the bubbles off of the swing arm which may result in a bad reading. Also, if the little counterweight on the swing arm ever drops off, throw the hydrometer away. From time to time, check your hydrometer against a calibrated refractometer or against a known standard, to ensure it's performing well.

It's pretty accurate. SmallReef checked with her refract and it was dead on the same as the hydro.

[Joshifer]

That's what I use, state of the art in the 70s

Aquarium companies have really come a far way these past 10 years. The hydrometer I have has the same accuracy as a members refract. I mean theirs no comparing the two but for a cheap hydro it's pretty good

[paul b]

There is no exact reading your salinity has to be, so your testing device also has no need to be as exact as it could be.  Close is close enough.

[lnevo]

The important thing once you get your tank really running is that the salinity if new water matches the water in your tank. At least close at this point i fill a 20g brute to the line of residue, dump in a pitcher of salt and boom. Same reading every time. Now I'm re-tuning it though since I'm adding more water now one extra cup...where am i going to find a nice 2quart + 1 cup container to make my life easier again

[Origami]

Check any device from time to time just to make sure it's still giving you a good measurement.

 

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