PPI aquarium filter mat: Can be used in all filter systems. The PPI refers to the pore size PPI = pores per inch. ✘ PPI 30 = fine ✘ PPI 20 = medium ✘ PPI 10 = coarse. ✮ A hamburger mat filter is an ingeniously simple filter system that is installed directly in the aquarium. The aquarium filter mat is available in blue or black for cutting to size or filter construction.
Aquarium Flter Mat, Aquarium Filter Sponge
PPI foam mats are often used to construct the so-called Hamburg mat filter. The foam mats are available in different pore sizes and dimensions. They can therefore be used in all filter systems. The PPI refers to the pore size PPI = pores per inch. A Hamburg mat filter is an ingeniously simple filter system that is installed directly in the aquarium. The filter foam mats are available in blue or black for cutting to size or filter construction.
