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Freshwater addition effects on salinity calculator

This calculator takes the amount of water in your system, your current salinity, and the amount of freshwater you will add. It returns the salinity of the system after the freshwater is added and has mixed with the system.

For Example, if you have a 40 Gallon Tank at a salinity of 36ppt and you need to add 1 gallons of fresh water, then you would enter 40 gallons, 36ppt, and 1 gallons. The calculator will tell you that your salinity will be approx. 35.1ppt.
Gallons in system:
Salinity of system (either SG or ppt is accepted):
Gallons of Fresh Water:
Resulting Salinity in PPT:35.1
Resulting Salinity in Specific Gravity:1.026




Disclamer: SaltyZoo does not take any responsibility for the use or misuse of this tool. It is your responsibility to always be aware of and understand the effects of making changes to your water chemistry.
For questions or comments regarding this tool, please email me

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