Filter foam for mechanical and biological filtration PPI10 - pore size of 10 pores per inch
Filter foam for mechanical and biological filtration PPI20 - pore size of 20 pores per inch
Filter foam for mechanical and biological filtration PPI30 - pore size of 30 pores per inch
Filter foam for mechanical and biological filtration PPI45 - pore size of 45 pores per inch