Aquasky rot-4 replacement filters original organic cellulose for four stages under sink Aquasky rot four reverse osmosis water systems, a 99% reduction rate of bacteria, pesticides, herbicides, and heavy metals from tap water; the main stage in this system is the RO membrane.
 
All of the other replacement filters are serving and protecting that membrane. If the pre-filters fail to work due to poor quality, your RO membrane will not give you a 99% reduction rate. It includes three filters and a membrane that must be replaced periodically; the different filters represent the various stages that the water goes through while being purified. Generally - Pre-Filters and post-Filters in aquasky RO systems can last around 8 To 12 months between changes.
 
Only the original organic RO membranes can last as long as 5 years.
 
 Stage 1-
The sediment filter is the first filter installed in the Aquasky rot-4 reverse osmosis water filter system.
The primary function of a sediment filter is to remove large and fine particles from 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: ( DXI 8.2 X 1/4 - 7/8") x 2.5" 
Lifetime: please replace every year, depending on the water quality.

This filter is wrapped and sealed and meets NSF Standards and Regulations. The filter will fit any residential reverse osmosis unit that features standard 10” filter housing  ( look for compatible systems list )
 
stage 2-
Organic original Activated Carbon Block
The filter is made of fine coconut shell carbon 
Remove odors and tastes of many organic compounds and chlorine especially.
Because these filters are made of packed carbon (forming a cylinder block), they offer a much finer filtration of suspended particles and dirt.
Micron rating: 5 Micron.
Dimensions: ( DXI 8.2 X 1/4 - 7/8")  x 2.5"
Lifetime: please replace every year, depending on the water quality.

This filter is wrapped and sealed and meets NSF standards and regulations. The filter will fit any residential reverse osmosis unit that features standard 10” filter housing ( look for compatible systems list )
 
Stage 3-
Original organic aqua sky ROT-4 - 50 GPD NSF certified thin film TFC
The membrane is the main component of the Aquasky rot-4 reverse osmosis unit.
Made with 100% Organic fine thin film flat sheet
99% reduction rate of bacteria, pesticides, herbicides, and heavy metals from tap water.
 Only the original organic aquasky rot -4 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, and 20 Times smaller than any virus. 
 
Product Features: 
50  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, 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 -
The original organic Inline carbon filter for Aquasky rot-4 is known as a polishing filter because they are usually the last stage of any standard reverse osmosis circuit.
Made of high-quality coconut shell carbon, they stabilize the water-tasting qualities and remove any traces of nasty tastes and odors.
Dimensions: 10.7 " x 2.3"
Lifetime: please replace ones in 1- 2 years.
 
This filter is wrapped and sealed and meets NSF Standards and Regulations.