This calculator estimates the volume of water in your aquarium by noting the change in salinity that
occurs when a known quantity of freshwater is added.
To use this calculator, first measure the salinity of your system. Then, add a known amount of RODI
freshwater and let it mix thoroughly with your system water. This usually takes between 10 and 60 minutes
depending on your setup. After the water has mixed, test your salinity again.
To get a reasonable estimate from this calculator with a salinity measuring accuracy of 0.1ppt, you
will need to add enough RODI water to cause around a 12% drop in salinity. If your salinity measuring
accuracy is 0.01ppt, you will only need around a 2% drop in salinity
(
).
The accuracy of this calculator can always be increased by creating a larger salinity drop (up to 50%)
and/or using a better salinity measuring device. However, keep in mind that too large of a drop in
salinity can have a detrimental effect on your tank inhabitants.
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