<p>The primary objective of the study is to provide an analysis of Roof-Top Harvested Rainwater Filtration Systems (RTHRWFS), importantly emphasising the findings that will be pivotal for future innovation and development in filtration technologies for a promising and effective adaptation of RTHRWFS by the masses. The work addresses a gap in the global Roof-top Rainwater Harvesting (RTRWH) implementation using detailed Prismatic and Bibliometric Analysis. The study has thoroughly examined distinct technical approaches, the structural cost, and public consciousness hindering global acknowledgement of RTRWH systems. It discusses the influence of the composition of rainwater, roof materials, and implementation of the first flush on the concentration of roof runoff. Further, our study delves into the probable areas of the sustainability and pursuance of these practices, potential improvement in existing system designs, and possible proficiency gaps. The work presents a framework for evaluating the sustainability of roof-top harvested rainwater intending towards high (installation, operation and maintenance) cost, less public recognition, low filtration rate, liability towards microbiological contamination etc. It also points out the symbolic roadblocks pertinent to skills and technological implementation, hence curtailing the extensive adaption of these systems globally. Our paper reiterates the critical areas in filtration technologies, focusing on the evolution of competent, economic and sustainable filtration methodologies catering to the long-term storage needs and diverse demands along with ensuring public awareness related to contaminants primarily present in rainwater, reassuring embracement of filtration systems for better domestic and potable use.</p>