Sam Ratulangi University held the ToT Eco-Enzyme series IV program for the Central and Eastern parts of Indonesia which was held on Thursday, April 29, 2021. This ToT program was the fourth event in the Eco Enzyme Series which was held under the auspices of the UI GreenMetric World University Ranking. This implementing team is a collaboration of the National Eco Enzyme Team from 11 Universities in Indonesia.

This event presented three speakers including Dr. Ir. Nurzainah Ginting, M.Si from the University of North Sumatra (USU), Siska Alicia Farma, S.Pd., M.Biomed from Padang State University (UNP) and Dr. Veronica A. Kumurur, S.T., M.Si from Sam Ratulangi University. The event was opened with remarks from the Rector of Sam Ratulangi University, Prof. Dr. Ir. Ellen Joan Kumaat, M.Sc., DEA, who at the same time reminded us of the importance of preserving nature, especially Earth Day, which was also celebrated on April 22nd. The event was continued with remarks given by the Head of UI GreenMetric, Prof. Dr. Ir. Riri Fitri Sari, M.M., M.Sc and continued with the takeover of the event guide by the seminar moderator who is the Coordinator of the UI GreenMetric Sam Ratulangi University, Dr. Indri S. Manembu, S.IK., M.Si.

The seminar was then continued with the presentation of the material by the first resource person, namely Dr. Ir. Nurzainah Ginting, M.Si who is also the Coordinator of UI GreenMetric, University of North Sumatra. He presented material entitled "Utilization of Eco Enzyme Products in the University of North Sumatra". He talked about the USU campus's efforts to create a campus that cares about the environment, such as a program for making eco enzymes to be distributed to government agencies such as the Medan Animal Husbandry Service which is used as a disinfectant. The presentation of the material was continued by the second resource person, namely Siska Alicia Farma, S.Pd., M.Biomed. He brought material with the title "EcoEnzyme Making Practices" which here explains about food waste that has not been processed optimally, especially in Indonesia. Eco Enzyme can then be a solution to dealing with organic waste which is much more useful than just being made as compost.

The last presentation of material was delivered by Dr. Veronica A. Kumurur, S.T., M.Si. He shared about his experience in making Eco Enzyme which has created a new community about Eco Enzyme in North Sulawesi. This community itself has carried out many activities by utilizing organic waste / waste in the city of Manado, even though it was only formed in 2021. The webinar itself got even more exciting with the question and answer session that was held, where the number of participants who attended reached 300 people, the maximum capacity of the number of participants who could participate.