4 STAGE Reverse Osmosis System Compatible Replacement Water Filters Original Organic cellulose under sink,  Reverse Osmosis System Compatible Replacement Water Filters include 3-4 filters and a membrane that must be replaced periodically.
The different filters represent the different stages that the water goes through while being purified.Generally - Pre-Filters and Post-Filters in RO systems can last aroumd 8 To 12 months between changes.
 
Only the Original Organic RO membranes can last as long as 5 years 

 
 Stage 1-
Sediment filter is the first filter installed in all Reverse Osmosis water filters systeme .
The main function of a sediment filter is to remove large and fine particles from a drinking water, such as sand, dirt, silt, and rust particles. Removal of such particles allows for a better performance of all the following filters, such as Carbon Block or GAC filters.
Micron rating: 5 Micron.
Dimensions: ( 9 7/8") 
Lifetime: Replace every year, depending on the water quality.

This filter is wrapped and sealed and meets NSF Standards and Regulations. Filter will fit any Residential Reverse Osmosis Unit that features standard 10” filter housing
 
 
stage 2-
Organic Original Activated Carbon Block Filter are made of fine coconut shell carbon 
remove odors and tastes of many organic compounds, chlorine especially. Though, because this filters are made of a packed carbon (forming a cylinder block), they offer a much finer filtration of suspended particles and dirt.
Micron rating: 5 Micron.
Dimensions:  ( 9 7/8")  x 2.5"
Lifetime: Replace every year, depending on the water quality.

This filter is wrapped and sealed and meets NSF Standards and Regulations. Filter will fit any Residential Reverse Osmosis Unit that features standard 10” filter housing
 
Stage 3-
Sealed green reverse osmosis membrane 50 gpd to 80 GPD NSF Certified Thin Film TFC Membrane is the main component of all 5 stage Reverse Osmosis Units.
Made with 100% Organic fine thin film flat sheet
99% reduction rate of bacteria, pesticides, herbicides, and heavy metals from tap water.
 membrane has The micron rating of a thin film less than 1/10000th of a Micron
which is  620,000 Times Finer Than A Human Hair  2,500 Times smaller than bacteria 20 Times smaller than any virus 

Product Features: 
50 TO 80 Gallons Per Day (15.8 -19.6 Liters per Hour) Capacity
99% Stabilized Salt Rejection (Minimum Rejection 97%)
NSF/ANSI Standard 58 listed

 
Operating Conditions Performance specifications based on 500 ppm tap water, 50psi (0.35 MPa) applied pressure, 77°F (25°C) feed water temperature, feed water pH 7-8 and 15% recovery. Element permeate flow may vary ± 15%.
Maximum operation pressure: 125 psi (0.86 MPa)
Maximum feed flow rate: 2 gpm
Maximum operating temperature: 113° F (45° C)
Maximum feed water turbidity: 1 NTU
Maximum feed water SDI (15min): 5
Chlorine tolerance: 0
Feed water pH range: 2-11
Minimum brine flow to permeate flow ratio: 4:1

 
Stage 4-
 reverse osmosis Inline Carbon Filter - is also known as polishing filters, because they would usually be the last stage of any standard Reverse Osmosis circuit. Being made of high quality coconut shell carbon they stabilize the water tasting qualities and further remove any traces of bad tastes and odors.
Dimensions: 10.7 " x 2.3"
Lifetime: Replace ones in 1- 2 years.

 
This filter is wrapped and sealed and meets NSF Standards and Regulations.