I do not think the salt can hurt you. I've read that if you absorb all the water, it is because you are very dehydrated and your body needs the water....and you probably also need the minerals in the salt.
If nothing happens after about 2 hours of doing the flush...do it again, making sure to use Sea Salt and WARM water and this time, try using more salt in the quart of water than you did before...at least a tablespoon and 1/2 this time...so salty that it's a little hard to drink. Everyone that persists, should be able to make this work.