A full gallon of mixed freshwater phytoplankton, tens of billions of algal cells. For fish rooms dosing multiple cultures every day. All freshwater, cultured in house in Vermilion, Ohio and bottled fresh the morning it ships. Orders go out Monday through Wednesday only so nothing sits with a carrier over the weekend. 100% live arrival guarantee, if anything shows up DOA I reship it free, no photos or claim forms needed.