Ton O Bud - When to use it?

Hi folks, i'm growing 5 plants in 5 auto pots using coco as a growing medium. I have 600w of HPS and 200w of HOT5.

I'm currently 18 days into bloom.

I'm dosing Ionics Bloom and Algamix.

I use RO water with the PH reduced to 6

I've been persuaded into getting some Ton O Bud from a retailer and i'm unsure as to when i should start adding it and for how long? Also, do I add PK13/14 as well or should this be used as a replacement?

ANy thoughts would be gratefully received.

just use ton o bud and youre nutriants ton o bud does exact same job as pk but better
start using it when you start to get node sites 1st to 2nd week

Do you yous ton o bud all threw flowering satge and hw much of ton a bud would a mix into a 3 ltr bottle