Filter Sponge PPI & Pore Size Chart - Is Higher PPI Always Better? (GAOLESHI)

PPI (pores per inch) is the core spec of filter sponge. Which scenario fits PPI 10/15/20/30/45/60? How to choose between 10 PPI and 60 PPI? GAOLESHI, a 15-year foaming manufacturer, provides the PPI chart and selection guide.