simple and easy! use cigarette head(filter) material to plug it into air tube. it works perfect with diy co2(sugar + yeast) and cylinder+ regulator. change a new material when u redo ur diy co2. if u do correctly, bubbles will be very tiny. just like glass diffuser. u also u also can use bamboo chopstick as material.
sorry if someone already post this...
enjoy,
Tim
sorry if someone already post this...
enjoy,
Tim