Gas is faster and less messy, also I can't fit marbles in the neck of some of my 600mL amber bottles. I have also always wondered about any elements from the glass contaminating the chems. Regards Peter On 26 June 2013 00:20, Bogdan <bkarasek@xxxxxxxxxxxx> wrote: > Hello, > > What about the old idea of using marbles to fill the container to replace > the chemicals that have been used up. This way, the container is always > topped up with chems..... no oxygen. > Problem solved..... or is it??? >