As much as I want to put my brine free salt that has been washed for 3 years to get the acidity out of the salt, it is the epson salt that make you float. I do keep 3 or 4 cakes and cones in the tub which I always bring with me anytime I go to a float spa.
Epson salt and especially if the water is hydro-phillic (not phobic) pulls out crazy amounts of toxins and bodily heavy metals. The salt helps purifiy these wastes from the body and also having a good filtration system helps too.
Note: We now have someone that sells infused epson salt. They charge the salt with frequencies and algorithms similar to the way they charge those bracelets people are wearing in gyms and everywhere for balance and strength. If you put a red chili pepper in the tub with infused salt, the red pepper that once once super hot will taste milder like a bell pepper. You can also use one of the pens. There are over 10,000 videos on youtube showing this and I have watched so many of them. The coolest is when you put a bottle of beer in there or even the whole six pack. They will not even get buzzed by drinking as the beer even without opening up the bottle has been restructred and there is a strong right spin on all the contents of the beer and makes it almost impossible to get the effects of alcohol. Works the same with wine too. It's like being in float spa with thousands of energy balance pendants. You can take a meter from Radio Shack and test the body voltage before and after the float spa and see a crazy difference. The biggest difference in the persons voltage happens when the infused, charged salts raise the body voltage naturally. Rememeber, the salt will eventually lose its ion output over time. In the ocean, the water is always structured with the perfect TDS solution and the salt remains the same. If the water is structured properly, the salt should need to replaced often for maximum results.
And HE went forth unto the spring of waters, and cast the salt in there, and said, Thus saith the LORD,
I have healed these waters; there shall not be from thence any more death or barren land 2 KINGS 2:21