looking for replacement parts for your Puromax reverse osmosis filter? the set of 4 filters  that includes original organic cellulose for the 4-stage under-sink system can be a good option. These parts can ensure a 100% reduction rate of bacteria, pesticides, herbicides, and heavy metals from tap water. The most important element in this system is the RO membrane, and all the other replacement filters are there to serve and protect that membrane. If the pre-filters fail to work due to poor quality, your RO membrane won't give you a 100% reduction rate.
 
The set includes 3 filters and a membrane that must be replaced periodically.
These 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 around 8 to 12 months between changes.
Only original organic RO membranes can last as long as 5 years.
 
Stage 1:
The sediment filter is the first filter installed in the Puromax 4-stage water filtration system. Its main function is to remove large and fine particles from drinking water, such as sand, dirt, silt, and rust particles. Removal of such particles allows for better performance of all the following filters, such as carbon block or GAC filters. Its micron rating is 5 microns, and its dimensions are (DXI 8.2 X 1/4 - 7/8") x 2.5". Please replace it 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 a standard 10” filter housing (look for compatible systems list).
 
Stage 2:
The organic original activated carbon block filter is made of fine coconut shell carbon to remove odors and tastes of many organic compounds and chlorine, especially. Since these filters are made of packed carbon (forming a cylinder block), they offer a much finer filtration of suspended particles and dirt. Its micron rating is 5 microns, and its dimensions are (DXI 8.2 X 1/4 - 7/8") x 2.5". Please replace it 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 a standard 10” filter housing (look for a compatible systems list).
 
Stage 3:
The 100% organic NSF certified thin film TFC membrane is the main component of Puromax 4-stage water filtration systems. This membrane is made with 100% organic fine thin film flat sheets and can provide a 99% reduction rate of bacteria, pesticides, herbicides, and heavy metals from tap water. Only the original organic membrane has a 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. This product features a capacity of 50 gallons per day (15.8 - 19.6 liters per hour) and 99% stabilized salt rejection (minimum rejection 97%). It is also NSF/ANSI Standard 58 listed.
 
Operating conditions:
Performance specifications are 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%. The maximum operation pressure is 125 psi (0.86 MPa), and the maximum feed flow rate is 2 gpm. The maximum operating temperature is 113°F (45°C). The maximum feed water turbidity is 1 NTU, and the maximum feed water SDI (15min) is 5. Its chlorine tolerance is 0, and the feed water pH range is 2-11. The minimum brine flow to permeate flow ratio is 4:1.
 
Stage 5:
The original organic inline carbon filter for Puromax water filtration systems is known as polishing filters 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 further remove any traces of bad tastes and odors. Its dimensions are 10.7" x 2.3", and you should replace it every 1-2 years. This filter is wrapped and sealed and meets NSF Standards and Regulations.