How much salt per 600ml water?

For a typical saline solution, a concentration of about 0.9% salt (sodium chloride) is commonly used, which means you would add approximately 5.4 grams of salt to 600 ml of water. This concentration is similar to that found in human bodily fluids. Adjustments can be made based on specific uses, but for general purposes, 5.4 grams is a good guideline.