Package Included:1 x RO Water System FilterFeature:* High standard and the best filtration.* Suitable to be used in RO systems perfectly.* Provide pure water for your drinking everyday.* Remove up to 99.99% of Heavy Metals,Total Dissolved Solids.* Protect your home, health, and appliances by filtering your water.* Four specifications for selection:50GPD,75GPD,100GPD,125GPD.(TDS),Bacteria,Arsenic,Chlorine,Cadmium,Pyrogens,Giardia,Viruses,Cyanide,etc.Specification:Color:BlueSize:300x60mmWeight:233gType:1:50GPD,2:75GPD,3:100GPD,4:125GPD*For example:Model:1812-75 – g18 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.75×3.785 is the total amount of water produced in a day.