exposed to dissolved zinc (Zn2+ (aq)) and copper (Cu2+ (aq)). The analytical results show that the mussel shell has a significant capacity for removing these metals from solution, most probably due to an exchange mechanism with calcium (Ca2+) ions from CaCO3. Further laboratory experiments were carried out to investigate how crushed Perna canaliculus shell could be implemented in stormwater filter systems. This was done by using flow-through rather than static experiments, the first of which had a long solution-solid contact time of around six hours and found that the absorption capacity was being exceeded at a loading of around 650 μm of Zn per gram of mussel shell. The second flow-through experiment decreased the solution-solid contact time to 30 mins, extended the shell particle size range and increased the amount of shell being used, each column containing 150 g of shell in contrast to 20 g initially used. The results of the second flow-through experiment demonstrated the near-equivalent relationship between zinc loading and calcium release and found that the column absorption efficiency was not