I have been using Repashy superfly since August I only make one culture every 2-3 weeks. For the last 2-3 cultures it has started to put off a bad odor after about 2 weeks. Normally it will start to do this past 30 days. The bag is stored in my frog room with it sealed. Does it start to go bad after four months.
Do you use excelsior? I've noticed the last culture I had was mixed with a bit more water because of drying out. this made the excelsior rot a few weeks in.. which smelled horrible! if so I'd try using coffee filters.