1/4teaspoon Sea Salt uniodized is recommended per one qt of water, if a person has water retention. The Sea Salt helps the urine leave the body. This is healthy is drink all the time. I AM NOT TALKING ABOUT THE SWF (Salt-Water-Flush) above.
The SWF (Salt-Water-Flush) is not for additional cleansing. It is to be used during a ten day MC.
Yes, Seasalt is also good to use in a tub of water like you suggested and if you don't have a tub, only a shower, you could also place the Seasalt on a scrubby and wash your whole body with it. I also use it on my scalp about once every two weeks. It makes the skin feel so soft,and I feel so refreshed. Best to You