The biggest cause of the SWF not to work is dehydration and the body trying to retain all fluids. Are you drinking at least half your body weight in oz of H2O daily? That would be a start. You might need to drink more depending on what you are eating.
You should NEVER add more than 2 tsp salt per 32 oz of water. The SWF DOES NOT WORK ACCORDING TO THE AMOUNT OF SALT. It works because the ratio of 2 tsp per 32oz of water is the same specific gravity as blood thus it does not get absorbed by the systemunless you are dehydrated. Are you using uniodized sea salt??
First you need to drink the minimun of half your bodyweight in oz of water each day. Then I would do a lax tea at bedtime to loosen things up. Upon arising drink 16oz of plain water then 1/2 hr later do the SWF. If by 1 hr later you haven't had any movements then drink another 32 oz of plain water.