Cleanliness is not only in the application of water to worship, but also in safety aspects for daily usage like drinking and recreation. One of the approaches in landscape ecology, known as phytotechnology, makes use of engineering, science, and plants as living technology to address ecological issues. Phytotechnology refers to the use of plants in technology, while 'phyto' refers to plants. Plants have developed mechanisms including chelation and sequestration via various ligands that regulate the uptake and accumulation of both essential and non-essential heavy metals. Mangrove species, fern species, bryophytes, algae and aquatic plants are among the plant species that are covered in detail in this book. Their function and potential to remediate the pollutants in the natural environment are well-known. Therefore, the valuable information in this book may serve as reference material for researchers, stakeholders, ecologists, landscape architects, agriculturists, horticulturists, and professionals working on all aspects related to plants and ecosystems.