
The installation instructions should state that you need to remove the internal filter cartridge and plastic liner. I was willing to send it back due to lack of water pressure when flushing as instructed. I took it apart to get as much water out as possible before sending it back to find the cartridge is wrapped in plastic which provides excellent water pressure when removed.

NANPU Compressed Air Filter Regulator Combo: Brass Element, Semi-Auto Drain, 0-150 Psi Gauge, And More
21 Review

NANPU 1/2" NPT Air Drying System - 5 Micron Particulate Filter, 0.01 Micron Coalescing Filter, Air Pressure Regulator Combo - Semi-Auto Drain, Poly Bowl W/Metal Gauge
23 Review

NANPU Air Drying System With Double Filters And Pressure Regulator Combo For Clean And Controlled Air Supply
18 Review

Filter under the sink Aquaphor Favorit ECO silver
20 Review