The book "Methods of analysis and treatment of natural and wastewater" by Orlov T. N. and Ganji W. In. represents an important contribution to the field of ecology and environmental protection. This publication, published by Yaroslavl State University, becomes an indispensable tool for students, graduate students and specialists working in the field of water supply and sanitation, as well as for anyone interested in environmental issues and sustainable development. The book discusses in detail modern methods of analysis and treatment of both natural and wastewater. The authors focus on the relevance of the topic, because the purity of water bodies and the quality of drinking water is not only a matter of public health, but also the sustainable development of ecosystems. In the face of global climate change and growing water pollution, knowledge of water treatment and analysis methods is becoming especially important. The book covers a wide range of topics, ranging from physicochemical methods of analysis to biological methods of purification. The authors share their knowledge of modern technologies such as membrane processes, adsorption, coagulation and flotation. Each chapter is written taking into account the latest achievements of science and technology, which makes the material relevant and useful for practical application. Special attention is paid not only to theory, but also to practical aspects. The book contains many examples, illustrations and tables that help the reader better understand complex processes and methods. This makes the publication not just a training manual, but a real guide for practitioners . Readers will be able to find answers to questions regarding the choice of optimal treatment methods for different types of wastewater, as well as recommendations for their application in real conditions. Who can like this book? It will be of interest to students and graduate students of environmental and engineering specialties, as well as specialists in the field of environmental protection and water supply . If you work in the field of ecology, water management or just interested in environmental issues, this publication will be a real find for you. The book will be useful for both beginners and experienced professionals seeking to update their knowledge and get acquainted with the latest trends in the field of water treatment. The style of the authors is distinguished by clarity and accessibility of the presentation, which makes it easy to digest even the most complex topics. Orlov T. N. and Ganja W. In. are experienced specialists who not only understand their field perfectly, but also are able to convey information to the reader. Their previous work is also noteworthy, as they cover a wide range of issues related to ecology and environmental protection. The book “Methods of analysis and treatment of natural and wastewater” is not just a textbook, but an important tool for all who seek to improve water quality and preserve ecosystems. In the face of constant population growth and increasing pressure on water resources, the knowledge contained in this publication is becoming especially relevant. By reading this book, you will not only gain theoretical knowledge, but also learn how to apply them in practice, which will certainly help you in your professional activities. If you are looking for information about water treatment methods, analysis of natural resources or just want to deepen your knowledge in the field of ecology, then “Methods of analysis and treatment of natural and wastewater” will be your reliable assistant and source of inspiration.