Cut the line close to the stone, then cut a vertical cut in the hose still on the stone and take off. The stones don't make the mist of bubbles though so diffusion is not the best. As far as getting the good seal, just cut a smaller than needed hole in the lid of your DIY bottle, cut the end of the line at an angle and pull through with pliers. The hose will seal itself. I did this when I was DIY and it never leaked. I ended up going pressurized, as it is much more reliable in colder temps, didn't run out after a week, etc.