Thought i would have a go at a DIY Co2 system with a bubble counter. I took a few pics to show how i did it.
I used a 2ltr juice bottle, some silicone tubing, a check valve, Silicone sealer and a small plastic tub.
First i drilled 3x5mm holes, 1 in the juice bottle lid, 2 in the tub lid.
I...