DIY Snow Pressure Pump : 11 Steps - Instructables
Step 7: Fill With Glass Wool and Cap It. Fill the big barrel with the glass wool. Be aware of that maybe you will have to put more or less glass wool to produce more or less . Usually: more shampoo = less glass wool; less shampoo = more glass wool (You have to test the amount). To cap one syringe on another, you have to enlarge the plastic.