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Aqua Sky, inc. Since 1998 

Toll-free U.S.A & Canada


U.S.A (tech support ) +1-954-297-5093



 Worldwide Shipping From The Following Locations


Website last update / the 30th of October 2023

Order Processing


  • U.S.A, Canada, Europe and Australia free shipping all orders.

  • Orders will be dispatched within one business day after an order has been received.

  • Orders placed on Friday after 3pm (Pacific Time) will begin processing the following Monday.

  • Confirmation email will be sent to customers once the order has been dispatched.

  • Please feel free to contact us for any additional information by email Phone toll free  1(800) 551-3221 

  • (New York U.S.A.) 

  • (California U.S.A.)

  • (Ontario Canada.)

  • (Athlone, Dublin Ireland.)   

  • (Manchester, U.K.)

  • (Dijon, France.)

  • (Nürnberg, Germany.)

  • (Kapfenberg, Austria.)

  • (Alice Springs, Australia.)

Set Of 3 original organic replacement filters cartridges standard size all 5 stage under sink reverse osmosis water systems.



5 Stage Aquasky under sink reverse osmosis water systems include 3 pre and post-filters and a 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.100% 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 serve and protect that membrane. If the pre-filters fail to work due to poor quality, your RO membrane will not give you a 0100% reduction rate.


             Stage 1 - Pre-Membrane reverse osmosis sediment filters

  •  High-Grade 5-micron high-capacity sediment filter 

  • Remove larger particles & suspended matter such as dirt, silt, rust, and sand from water.   

  • Protects and extends the life of the membrane and system.
  • Recommend replacement every 8-12 months, varies depending on the water source quality   
  • Standard Size Aquasky rot-4 water filters 24-3/4" / 10" 5.5 /15-( 97%)

  • Stage (1) Pre-membrane

Stage 2-
Original organic activated carbon GAC filters are well-known for their highly efficient reduction of chlorine taste and odour.
Taste and odours of many organic chemicals and volatile organic compounds.
All GAC filters are made with organic, high-quality coconut shell carbon.

  • 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 CTO coconut shell carbon block filter
  • Forcefully remove pesticide residues in water, water pollution odour of ozone, chlorine removal of residual heavy metals, bacteria, sterilization.
  • Standard Size 24-3/4" / 10" 5.5 /15-( 97%)

  • Recommend replacement every 8 To 12 months.

  • Protects and extends the life of the membrane and system.

  • Stage (2) & (3) Pre-membrane

  • Aquasky Rot-4 reverse osmosis replacement filters cartridges.
  • Tankpro Pro 3.2 & 4.4 reverse osmosis replacement filters cartridges.
  • PA-E reverse osmosis Ro-132 replacement filters cartridges.

Aquasky ROT-4 Original Organic Set Of 3 Pre And Post Replacement Filters

SKU: AQS-01325547760-3


    • US Water Reverse Osmosis Water Filters.
    • US Water Galaxy Reverse Osmosis Water Filters.
    • US Water Aquapurion Reverse Osmosis Water Filters.
    • Watts 5 stage Reverse Osmosis Water Filters.
    • Purevalue Reverse Osmosis Water Filters.
    • Proline Plus Reverse Osmosis Water Filters.
    • Proline Gold Reverse Osmosis Water Filters.
    • Nelson Reverse Osmosis Water Filters.
    • Isopure Reverse Osmosis Water Filters.
    • iSpring Reverse Osmosis Water Filters.
    • Tier1Reverse Osmosis Water Filters.
    • Hydronix Reverse Osmosis Water Filters.
    • Max Reverse Osmosis Water Filters.
    • AQUARIUM Reverse Osmosis Water Filters.
    • APEC Reverse Osmosis Water Filters.
    • APEX Reverse Osmosis Water Filters.
    • Titan Water Pro Reverse Osmosis Water Filters.
    • Home Pure Reverse Osmosis Water Filters.
    • Premier Reverse Osmosis Water Filters.
    • Blue Wave Water Reverse Osmosis Water Filters.
    • COP and all standard 5 stage RO Systems.
    • 4 stage ro filter replacement kit.
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