Welcome to our forum.
I filled mine in and jumped right in when it came up to temp. Some people have talked about using Swirl away on new tubs and finding it removing a bunch of junk, but even after a year that wasn't the case.With Chas' law that you will probably want to change water after the first month's usage because of the extra amount of chemicals that newbies seem to use, I would skip the initial flush, at least of a new tub.
That is the truth! I have been on a learning curve and I will change my water within the first month.
Gary,When my LSX was delivered, it was in the factory shipped packaging....I'd be surprised if yours isn't delivered the same. I filled mine, dropped in some dichor and in a couple of hours, I was in it enjoying my first soak (it heated up quickly in the full sun in the middle of July). Not one follicle suffered any "itis". I did add Swirl Away at the first water change but found no evidence of "yucky pipe stuff". I suggest you do the same including, as others suggested, changing the water after the first month and adding Swirl Away at that time. Good luck and don't go crazy waiting! Heck, come on down to sunny Florida and we can soak and drink martinis in mine!