Nope... just salt.
Keith, make sure though that if its the first time using the unit you get rid of the first 10g or so =)
You will have to add some RO right if you want to use some in your FW tank.
make sure to do a water test and see if your RO unit is getting all the bad stuff away ^^v
won't hurt to do a little test, right? hehe
Thanks Mike, it's a great read.