What you need
A bunch of bananas
LABS (see link in signature)
Brown sugar
A 5 litre tub with lid
Dechlorinated water
What you do
It works best if you have a blender for making smoothies with but if you don't, chop up the bananas as small as you can.
Pop them into a blender (or chop) with dechlorinated water and a tablespoon of brown sugar
Turn them into a smoothie
Add this to a 5 litre tub and fill the remainder of the tub so you have about 4 litres of mixture in there.
Add your LABS and supersaturate it with brown sugar. To do this, you add brown sugar until no more will dissolve. You'll feel the grains when you touch the bottom of the tub with a spoon.
Leave this for 2 weeks with the lid on, but crack one corner to let gases escape.
After 2 weeks has gone by, it should smell like something you want to drink. Don't drink it lol
If it smells like vinegar, it's not quite ready. If it smells like banana candy it is. Use at 1ml per litre and work up. I've never used more than 3ml per litre of this stuff.
It gets stronger over time too so be careful!
If it looks like this
It's gone bad.
Any green/brown/black mold on the surface is a sign you need more LABS or start again. This is the first time this has happened to me so I'm adding more labs and sugar and praying they take over. If not, I'll start again. I'll update it here.
What you want is a nice white mat of growth on the surface. This means the Lactobacillus is happy and eating the banana and sugar and you'll have your own PK booster for your plants.
The first time I used this, they were praying to the lights. They really like it!