Two-stage pre-filter – effective protection against particles, rust, and suspended solidsThe MAUNAWAI® pre-filter has three times the dirt-holding capacity compared to conventional filter cartridges of similar size.Effective two-stage filtration:Outer layer (25 μm): reliably traps larger particles such as sand, mud, rust, and pollen.Inner layer (1 μm): removes the finest suspended solids and en...