coolant for 1997 sc1

just bought a 97 sc1 for my daughter, the person i purchased it from had replaced a rad. hose and didn't have antifreeze so he put water in it, lives outside of town and it is not winter, anyway he said to drain and refill with antifreeze so i put in some regular green coolant that i keep premixed. my question is, is this coolant ok or do i need something else, have never had a saturn and am not familiar with them or their maintenance issue's