Salinity question

[friendlyAlien]

Hi,

I have a simple question about salinity measured in ppt. Is the relationship between amount of salt linear? Means if 1000g salt raise salinity by 10 ppt. Will adding another 100g raise it by another 1ppt? (note numbers are definitely wrong, even if linear).

If it is not linear, do we know the relationship between the two?

 

[Randy Holmes-Farley Verified Community Expert]

Yes, it is linear. ppt stands for parts per thousand, so grams per kilogram, for example.

 

[Randy Holmes-Farley Verified Community Expert]

FWIW, a mathematician might quibble with the exact use of the term linear since it is weight salt per total weight, not weight salt per weight water, but it is close enough for any reefing purpose.

 

[friendlyAlien]

Thank you!

 

[nbow128]

New reef enthusiast here! 20 gallon nano tank with a salinity of 30ppm. what is the safest way to raise it to 35?

 

[Randy Holmes-Farley Verified Community Expert]

New reef enthusiast here! 20 gallon nano tank with a salinity of 30ppm. what is the safest way to raise it to 35?

Replace evaporated water with salt water until you reach the goal. :)

 

[KStatefan]

New reef enthusiast here! 20 gallon nano tank with a salinity of 30ppm. what is the safest way to raise it to 35?

What Randy said above but check your units.

 

[nbow128]

Replace evaporated water with salt water until you reach the goal. :)

Thank you! I opened my cover to promote evaporation Yesterday. I checked today and I'm up to 31ppm. Baby steps.

 

[Randy Holmes-Farley Verified Community Expert]

Thank you! I opened my cover to promote evaporation Yesterday. I checked today and I'm up to 31ppm. Baby steps.

ppt, always ppt. :)