Questions about sledge hammer flush

OK om just starting week 4 veg,

My question is this after week 4 I flush with sledgehammer , but how many times and for how long, one flush every 4 weeks, or 2 times a week, does this count as another week

I’ve never used it, but here’s a clip of the back of bottle.

Yeah got it

After week 4,7,10?

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I flush the week I make the switch from veg to flower , than I flush at week 5 in flower and than week 9 with sledgehammer 1 ml per gallon than my last flush is just plain ph water before harvest …hope this helps .

Yes thank you Yoshi

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How long after using sledge hammer can I harvests