Can anyone tell me on average how long one of these kits last , made from 2ltr soft drinks bottle , steady stream of fine bubbles. thanks in advance. Tom
If you mean the mixes, they usually last about 2 weeks (carries on bubbling after this, but not enough). If you mean the kit, varies depending upon wear and tear.
No, as dried yeast and sugar are quite cheap. lol. However pressurised kit is considerably less bother, and better designed for producing constant and stable quantities of CO2.