What you'll need:
20ltr bucket or pot
Biobizz Light Mix
Biobizz All Mix
Biotabs (just the tablets)
Biotabs Bio PK
How they use them:
So what they do is plant in light mix then transplant to full mix but that has a risk of stunting the plants growth, and with autos... That's the last thing we want to do. They've had years of practice doing this.
They also say you can fill large pots with the bottom half Biobizz Full Mix and the top half with Biobizz Light Mix. Then they just use water for the first 2 weeks. At the start of week 3 they add the tabs and continue with just water after that.
Other people on Reddit have adapted this method by using the Biotabs Bio PK too. Once you see the first sign of pistils growing, you wait 2 weeks and at the start of week 3 you add the Bio PK with every watering according to the instructions on the bottle.
The best way to grow weed is to keep things simple and it doesn't get much more simple than this. No need to check PH or EC or mix feeds or anything. Just dechlorinate your water for 24 hours before hand and you have more free time to dial in your environment and do some LST on the ladies.