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Aqua Sky - Since 1998



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Active  website / last updated February 2023

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Free  From The Following Locations :-  ​


(New York U.S.A.)

(California U.S.A.)

(Ontario Canada.)

(Athlone, Dublin Ireland.) 

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(Dijon, France.)

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(Kapfenberg, Austria.)

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Buy online - Amtrol reverse osmosis replacement filters cartridges, order a complete set of 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 filters represent the different stages 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 high-quality membrane can last as long as 5 years.

Stage 1-

  • The sediment cartridge is the first filter installed in the Amtrol 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: 9.75" x 2.5"Lifetime: Replace yearly, 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 Amtrol Reverse osmosis water filters.

Stage 2-

  • Activated carbon block filters are made of fine coconut shell carbon, which removes odors and tastes of many organic compounds, especially chlorine. Though, 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: 9.75" x 2.5"


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

Stage 3 -

  • Amtrol Reverse osmosis under counter sink replacement filters has a - 50 Gallon per day NSF-certified thin film TFC membrane, the main component of the Amtrol Reverse osmosis unit. They are made with 100% Organic fine thin film flat sheet with a 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 thinner than human hair, 2,500 Times smaller than bacteria, and 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 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): 5Chlorine tolerance: 0
  • Feed water pH range: 2-11
  • Minimum brine flow to permeate flow ratio: 4:1. This membrane is wrapped and sealed and meets NSF standards and regulations. The filter will fit residential reverse osmosis unit - amtrol Reverse osmosis water filters.

Stage 4-

  • Organic Inline carbon filter to work with Amtrol reverse osmosis water filters 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 remove any traces of bad taste 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.

Set of 4 Reverse Osmosis Replacement Filters Cartridges Amtrol RO-4

$126.00 Regular Price
$109.00Sale 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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