There are numerous uses for hydroxyapetite (HAp) in the purification of water. Heavy metal ions from aqueous solutions are removed using HAp-based filters . For the elimination of Cd +2 ions in water treatment, sol-gel synthesised HAp -Chitosan nanocomposites have been utilised . Fishbone has been found to contain HAp. At 1000 o C, HAp developed crystalline phases and a porous structure. It demonstrated promise for removing Cr ions from natural rivers . In order to create the 3D ordered HAp hollow microspheres that were first formed and then transformed into calcium phosphate spheres, soluble biopolymers such poly aspartic acid were used .