Step 1

Pour off as much of the dark hooch as you can.

Step 2

Discard most of the starter (you can either just remove it from the jar or place some of the starter into a clean jar).

Step 3

Feed the remaining starter with 100g of flour and 100g of water. Let it sit out at room temp for around 12 hours.

Step 4

Take 50g of starter from the jar and feed it another 100g of flour and 100g of water. Leave the starter for around 12 hours.

Step 5

After this second feeding it should double. If it does then it's ready to use. If it doesn't, repeat step 4 every 12 hours until it does.