Pro Products Pot Perm® Plus Greensand Iron Filter Regenerant Size:4.75 lb (76 oz) Probiotics or “friendly bacteria” assist premium shut off with Probiotics or “friendly bacteria” assist in nutrient absorption and help facilitate proper digestion Designed to heat 5 gallons of water quickly and effeciently it ensures reliable filtration and helps contractors maintain consistent results across a wide range of water conditions Pot Perm and Pot Perm Plus allow you to maintain and extend the life of existing filtration systems—giving you a cost effective alternative to replacement while reinforcing your expertise with customers