How to Choose the Right Industrial Water Filter Cartridge Choosing the right industrial water filter cartridge comes down to four specs: the micron rating (what particles you need to remove), the flow rate (how much water moves through it), the housing compatibility (whether the cartridge physically fits your head), and the replacement schedule (how long it lasts at your usage). For most foodservice and light industrial applications, a 5-micron carbon block cartridge in the 3M HF series, sized …