Filters down to 5 Microns which is in the particle filtration category and is equivalent in size to milled flourEasy filter maintenance, with the unique swivel-valve, push-button assembly allowing for one-step filter changes that doesn't require shutting off the water sourceThe 105351 Carbon Pre-filter is designed for use with Watts Premier's RO Pure (531407, 531411), RO Pure Plus (531417) and Zero Pure Plus (531517) Reverse Osmosis SystemsFor system top performance it is recommended to change out the carbon pre-filter every 6 months or 1350 gallons
