Nothing other than the regular stuff. As the pool is filling, drizzle in some bleach after each foot or two of water is added. It doesn't take long for a freshly filled unchlorinated pool to turn green! Of course, you'll also need to add stabilizer once it is filled since there won't be any in there.

Please tell us that you are not filling from a well! We have had so many pools here on the forum this year filled from wells that are dealing with metals issues. I don't want you to be one of them!

Keep us posted how it is going and also let us know if you have questions along the way. We'll be right here!