updated: 2015-04-14
There is a big difference in fouling depending on the material used, according to a German study.
In Virtue CDs of polycarbonate is used, but you have every possibility to use also other material. In a school project in Kiel, Germany, they have tested various types of substrate in the form of garbage, to see what is growing on them. The results show that fouling (mainly barnacles and mussels) prefer glass over wood and alumninium.