Package Included: 1 x RO Water System Filter Description: -Provide pure water for your drinking everyday. -Protect your home, health, and appliances by filtering your water. -Five specifications for selection:50GPD,75GPD,100GPD,125GPD,400GPD. -Suitable to be used in RO systems perfectly. -Remove up to 99.99% of Heavy Metals,Total Dissolved Solids (TDS),Bacteria,Arsenic,Chlorine,Cadmium,Pyrogens,Giardia,Viruses,Cyanide,etc. -High standard and the best filtration. Specification: Color:Blue Type:3013-400G/3012-400G/1812-50G/1812-75G/2012-100G/2012-125G Size:3013-400G:33cm6.8cm/3012-400G:29.5cm6.5cm/1812-50G:30cm4.5cm/1812-75G:30cm4.5cm/2012-100G:29.5cm5.5cm/2012-125G:30cm5cm Model Description *For example Model1812-75 - g 18 is 1.8 inches in diameter, 1 inch is 2.54 centimeters. 12 is the length of 12 inches, and the total length of the film is about 29.7 centimeters. 75g is water yield, 1g is 3.785 liters. 75g is 24 hours of water production. 75x3.785 is the total amount of water produced in a day.