I assume you mean last 3-4 weeks...I don't use booster. that's the point of thread. I do like and will use until I run out; Overdrive the last week or 2 before final phase flush week.

My last 4-5 weeks:
every 5 gallons 40ml micro-80ml bloom-15ml calmag+.
when plants start to finish, and I see amber color trichs, I add Overdrive to mix for a week or 2 and flush a week

In a side by side comparison between dirt and hydro bucket. Yeah right! lol. Not even close enough to compare. Maybe if you had the ability to grow outside in the sun, but not indoors. No way. Not in the same time frame.
latewood Reviewed by latewood on . Latewood's Legacy: GH 3-part and CalMag tutorial and discussion After experimenting for 2 years with Advanced Nutrients/additives... Botanicare Pure blend Pro/additives...and GH3-part/additives. I fond this formula works and yields the best; And leaves the roots healthy throughout grow. Goodluck This should answer a lot of question's you newb's have, and It should save you some money in the longrun. Since a lot of you get caught up in the Lucas Method. I found this to yield more. However if you have space limitations, just remove the Grow from Rating: 5