Symbiota - Fermenting Crock - 4.5L** Out of stock until May back order only. Fermentation pots provide the perfect anaerobic environment. Symbiota's ceramic fermentation pots keep the internal temperature stable for the probiotic bacteria to thrive, unlike glass which is exposed to light and experiences temperature swings. Symbiota's fermenting crocks have been specifically designed to not only be the most beautiful pots on the market but also functional and easy to clean. Our