i never even noticed that before,it says 0.021-0.023 for marine and up to 0.26 for invertsok,illl look on the jug and see if it says anything
rrustenholtz said:That would be a 60 gallon water change. A little excessive and expensive to raise salinity 0.001 point.
It was just an easy example. You can also top off with saltwater until you reach desired salinity and then resume freshwater use.