*1st stage Pre-filter Spun PP 5 Micron
*2nd stage GAC Carbon filter
*3rd stage CTO Carbon block filter
*4th stage RO Membrane 50/75/100GPD
*5th stage In-Line Post carbon filte
Application
Extra option: 6th stage:UV lamp 1GPM / 10" in-line BIO ceramic filter / 10" in-line Mineralize filter