gravity or purple max first???

hey guys, i am at week 6 of bloom, plan on going 8 1/2- 9 weeks, growing grand daddy purple.

Should i use gravity first, if so, with nutes or without.

Or am i too late to use any of these.

any help would ne nice, thanks everybody..

you can use them at the same time but id be carefull it can burn the shit out of your plants. less is more do not use with nutes .