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Aqua Sky, inc. Since 1998 

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Website last update / the 30th of October 2023

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Buy online - Amtrol reverse osmosis replacement filters cartridges, order full set of 4 replacement filters for under sink amtrol reverse osmosis 4 stage filters under counter sink, parts for maintenance, service & Repair, under counter sink Amtrol reverse osmosis 4 stage water filter system cartridges include 3 Filters + 1 RO 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 around 8 To 12 months between changes.Only the organic high quality membrane can last as long as 5 years

Stage 1-

Sediment cartridge is the first filter installed in the Amtrol reverse osmosis water filters system .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: 9.75" 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 and Amtrol Revers osmosis water filters

Stage 2-

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: 9.75" x 2.5"


Lifetime: Replace every year, depending on the water quality.filter is wrapped and sealed and meets NSF Standards and Regulations. Filter will fit any residential reverse osmosis unit Amtrol Reverse osmosis water filters

Stage 3 -

Amtrol Reverse osmosis under counter sink replacement filters has a  35 - 75 Gallon per day NSF certified thin film TFC membrane is the main component of Amtrol Reverse osmosis unit.Made with 100% Organic fine thin film flat sheet 96-99% reduction rate of bacteria, pesticides, herbicides, and heavy metals from tap water.Only the original high quality reverse osmosis membrane has The micron rating of a thin film less than 1/10000th of a micron which is 620,000 Times tiner than A human hair 2,500 Times smaller than bacteria 20 Times smaller than any virus .


  • Product Features:50 Gallons per day (15.8 Liters per Hour) Capacity99% Stabilized salt rejection (Minimum Rejection 96%) NSF/ANSI standard 58 listed
  • Operating Conditions Performance specifications based on 800 ppm tap water, 50psi (0.35 MPa) applied pressure, 77°F (24°C) feed water temperature, feed water pH 7.5-8.6 and 27% recovery. element permeate flow may vary ± 15%.
  • Maximum operation pressure: 144psi (0.86 MPa)
  • Maximum feed flow rate: 2.2 gpm
  • Maximum operating temperature: 111° F (45° C)
  • Maximum feed water turbidity: 1.9 NTU
  • Maximum feed water SDI (15min): 5Chlorine tolerance: 0
  • Feed water pH range: 2.7-11.4
  • Minimum brine flow to permeate flow ratio: 4:1This membrane is wrapped and sealed and meets NSF standards and regulations. Filter will fit residential reverse osmosis units- and with Amtrol Reverse osmosis water filters.

Stage 4-

Organic Inline carbon filter for Amtrol under sink reverse osmosis water filters is 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: please replace ones in 1- 2 years.This filter is wrapped and sealed and meets NSF Standards and Regulations.

Amtrol Reverse Osmosis Replacement Filters Cartridges & Membrane - 4 Filters

$126.00 Regular Price
$119.00Sale Price
  • BUY ONLINE - Set Of 4 Replacement filters cartridges for Amtrol reverse osmosis RO-4 under counter sink water filters, Standard Size All 4 Stage under sink reverse osmosis water systems also compatible with  PA-E RO-132 Reverse osmosis under counter sink replacement & Tank pro-Pro 3.2 & 4.4 Reverse osmosis replacement filters cartridges -Original Organic Reverse Osmosis Replacement Filters Cartridges For Reverse Osmosis under counter 4 Filters units.

  • US Water RO Systems,

    US Water Galaxy, US Water Aquapurion,

    Watts 5 stage systems,


    Proline Plus,

    Proline Gold,






    Max Water Systems,




    Titan Water Pro,

    Home Pure,

    Premier Water System,

    Blue Wave Water,

    COP and all standard 5 stage RO Systems.


    Also Compatible With: 5EZ50, GTS-550S, NRO05-50, 200-GX-5050, ISO-RO5 GTS-550, Tier1, RO5-WF, RO550-W, W-525, WP5-50, RCW5

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