Sea shells used to clean up heavy metals

On the banks of the Saigon River in Vietnam, researchers have just completed tests on a new way to combat water pollution that could save millions of lives in coastal cities throughout the developing world.
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Bring Out the Hidden Beauty of Seashells – Beachcombing Magazine

Preparation of PVA/waste oyster shell powder composite as an

Water Purification with Seashells

Chemical composition of seashells and Portland cement

Preparing sea shells for crafts or display

Octopuses Are Increasingly Using Trash For Shelter, Harrowing Study Shows : ScienceAlert

Seashells: A Natural Solution to Water Quality Problems – Morgan Agro

Heavy metals in water - Carbotecnia

Sample Concept Papers, PDF, Filtration