Set of 5 Water filters replacement for 4 stage pa-e ro 132( long filters ), Aquasky rot-6 and Aquasky rot-14 ( For full list please look down for compatibility ) 18-35 gallons membrane, get all the correct information about replacement filters and membrane, change, service, parts for global, Universal 4 stage reverse osmosis under the sink drinking water systems, witch, what compatible replacement water filters should be used? How much it cost, and how often should you change the filters in a universal standard reverse osmosis system, first of all you have to understand that the main stage in this systems is the reverse osmosis membrane and all of the other filters are just serving and providing protection to the membrane, if the pre-filters failed to do the work because of it's low quality as an example, that means your RO membrane will never give you the quality of water you expect, here is some information will help you to understand how your RO system is workingReverse osmosis (RO) is a water purificationtechnology that uses a semipermeable membrane to remove ions, molecules and larger particles from drinking water. In reverse osmosis, an applied pressure is used to overcome osmotic pressure, a colligative property, that is driven by chemical potentialdifferences of the solvent, a thermodynamicparameter. Reverse osmosis can remove many types of dissolved and suspended species from water, including bacteria, and is used in both industrial processes and the production of potable water. The result is that the solute is retained on the pressurized side of the membrane and the pure solvent is allowed to pass to the other side. To be "selective", this membrane should not allow large molecules or ions through the pores(holes), but should allow smaller components of the solution (such as solvent molecules) to pass freely.very quality, organic cellulose fits all 5 stage under sink (Tri-Filters) drinking water systems reverse osmosis systems compatible Replacement Water Filters include 3-4 filters 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 around 8 To 12 months between changes.Only the Original Organic RO membranes can last as long as 5 yearsStage 1-Sediment filter is the first filter installed in Tri-Filter Drinking Water Systems Reverse Osmosis System Compatible Replacement 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.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 housingStage 2-Original Organic Activated Carbon GAC filter are well-known for their highly efficient reduction of chlorine taste and odortaste and odors of many organic chemicals and volatile organic compounds.All GAC filters are made with Organic high quality coconut shell carbon.Micron rating: 5 Micron.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 filter housing stage 3-Organic Original Activated Carbon Block Filter are made of fine coconut shell carbonremove 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.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 filter housingStage 4-reverse osmosis membrane 100 GPD NSF Certified Thin Film TFC Membrane is the main component of 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. membrane has The micron rating of a thin film less than 1/10000th of a Micronwhich is 620,000 Times Finer Than A Human Hair 2,500 Times smaller than bacteria 20 Times smaller than any virusProduct Features:50 TO 80 Gallons Per Day (15.8 -19.6 Liters per Hour) Capacity99% Stabilized Salt Rejection (Minimum Rejection 97%)NSF/ANSI Standard 58 listedOperating 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 gpmMaximum operating temperature: 113° F (45° C)Maximum feed water turbidity: 1 NTUMaximum feed water SDI (15min): 5Chlorine tolerance: 0Feed water pH range: 2-11Minimum brine flow to permeate flow ratio: 4:1