The owner is very friendly if you have any questions you always answers or gets back to you like within an hour or so is products are wonderful and he dedicates a very large room to culturing his own pods and phytoplankton and a sterile environment with no fish or any sort of wild or any possibility of fish diseases or invertebrates housed with these pods and phytoplankton a 16 oz bottle is plenty enough to start your own culture Even though I still buy more it's almost like dipping that whole bottle in there and plus having a small culture going because the bottles are so full you just can't resist dumping the whole bottle into your tank shutting the pumps off and everything and let them settle on the rocks and substrate 10 stars