Today, I went to a hot spring facility with my friends and experienced a salt sauna for the first time. Today, I went to a hot spring with my friends and experienced a salt sauna for the first time.

Don't have to put facility: not necessary.

The salt sauna uses salt to apply on the skin, removing waste products from within the body. The sauna uses salt to apply on the skin, removing waste products from within the body.

No reason to put salt twice. Need to put "from within" or just from.

I don't know if salt saunas are more effective than normal ones, but it was fun to rub salt on my skin. I don't know if salt saunas are more effective than normal ones, but it was fun to rub salt on my skin.

Do you know now or did you not know then? Either if they are effective or didn't know that.

In addition to this, there were a lot ofmany other kinds of hot springs there. In addition, there were many other kinds of hot springs there.

No reason to put "to this"- we already know what you're referring to. "Many other" flows better.

For instance, there was a stimulating carbonate spring withat included CO2 in the water and was a bit stimulating. For instance, there was a stimulating carbonate spring with CO2 in the water.

Just makes it less clunky.