In which flowering week am I supposed to use Ionic Boost

I have the full hydroponic Ionic nutes set (grow/bloom/boost/formulex/green fuse etc) which has been working quite nicely but now Im wondering exactly when am I supposed to use Ionic Boost & am I supposed to use it with Ionic Bloom or on its own? Keep in mind Ionic Boost contain only Phosphorus & Potassium NO NITROGEN.
So in which week of flowering should I add it to the reservoir tank. Oh & Im growing Blueberry (DJ short) which flowers in approximately 8-10 weeks I think.

I use it every week with the bloom. You are supposed to increase the dose of boost the last 3 weeks of flowering.

someone said:

I use it every week with the bloom. You are supposed to increase the dose of boost the last 3 weeks of flowering.

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But when do I begin to add the Boost with the Bloom?

From the very start, I use it. Every res change from day 1 of flowering til the end. It says on the bottle.

you should never use firt for the last 2-3 weeks of flowering for the last 2-3 you should be flushing, you dont want to be smoking firt!!!!!!!!!