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Reverse Osmosis RO systems remove impurities from your aquarium water such as chlorine, chloramines, pesticides, phosphates, heavy metals, and many others. Some of these impurities can lead to the growth of nuisance algae, while others may cause much bigger problems. The DI (De-Ionizing) cartridge does an excellent job removing phosphates, silicates, and nitrates from your tap water. Reverse Osmosis filters are highly recommended for reef tanks, Discus, and other South American Cichlid tanks and will also provide great benefits to any other type of aquarium setup. Numerous installation accessories are available for these reverse osmosis units including pressure pumps, reverse osmosis tubing and fittings, and replacement cartridges.

At AquaCave, we offer some of the best selection and best prices on High Efficiency RO/DI reverse osmosis units, replacement membranes, cartridges, fittings, tubing, TDS meters, Booster pumps, and accessories for you marine, reef, and freshwater aquarium.

60 of 189 Items
  • Kamoer X2SR Water Change System Kamoer X2SR Water Change System Kamoer X2SR Water Change System Kamoer X2SR Water Change System

    Kamoer

    Kamoer X2SR Water Change System

    Kamoer X2SR Water Change System Automatically Perform Water Changes X2SR is a water change system that can remotely control it through the mobile phone App using WiFi. The automatic water replenishment function can be completed through the submersible...

    $494.99
  • AutoAqua Smart AutoAqua AWC Duo G2 AutoAqua Smart AutoAqua AWC Duo G2 AutoAqua Smart AutoAqua AWC Duo G2 AutoAqua Smart AutoAqua AWC Duo G2 AutoAqua Smart AutoAqua AWC Duo G2

    AutoAqua

    AutoAqua Smart AutoAqua AWC Duo G2

    AutoAqua Smart AutoAqua AWC Duo G2 ALL-IN-ONETOP-NOTCH PERFORMANCE The Smart AWC Duo G2 is a complete AWC and ATO all-in-one system that automates water changes with ease. This powerful gadget is perfect for any sizes of saltwater and freshwater...

    $307.99
  • AutoAqua Smart AWC Duo - Auto Water Change + ATO AutoAqua Smart AWC Duo - Auto Water Change + ATO AutoAqua Smart AWC Duo - Auto Water Change + ATO AutoAqua Smart AWC Duo - Auto Water Change + ATO AutoAqua Smart AWC Duo - Auto Water Change + ATO

    AutoAqua

    AutoAqua Smart AWC Duo - Auto Water Change + ATO

    AutoAqua Smart AWC Duo - Auto Water Change + ATO Innovative Dual-Function Automatic Water Changer with Auto Top Off Automate your water changes and top off evaporated water with ease. Sit back and watch your aquarium flourish while saving time in the...

    $307.99
  • ATK v2 - Automatic Top-Off Kit - Neptune Systems

    Neptune Systems

    ATK v2 - Automatic Top-Off Kit - Neptune Systems

    ATK v2 - Automatic Top-Off Kit - Neptune Systems The ATK (Automatic Top-off Kit) is a simple, standalone, and complete solution for replacing water lost to evaporation. The new aquarium hobbyist has many challenges, but none is more annoying than the...

    $239.99
  •  Tunze RO Water Controller - 8555.000

    Tunze

    Tunze RO Water Controller - 8555.000

    Tunze RO water controller, 8555.000 TUNZE® RO Water Controller 8555 is an automatic water level controller used in the pure-water container of TUNZE® RO station. The controller is also suitable for other water tanks or can be connected to an...

    $234.99
  • Trigger Systems Titanium ATO - 10 Gallon Trigger Systems Titanium ATO - 10 Gallon Trigger Systems Titanium ATO - 10 Gallon Trigger Systems Titanium ATO - 10 Gallon

    Trigger Systems

    Trigger Systems Titanium ATO - 10 Gallon

    Trigger Systems Titanium ATO - 10 Gallon Description Trigger Systems Titanium ATOs are one of the best looking ATOs on the market. They match perfectly to the Titanium line of sumps. These ATOs have built in LEDs along with a LED remote and a...

    Was: $289.99
    Now: $231.99
  • Tunze Osmolator-3 3154.000 Auto Top-off System Tunze Osmolator-3 3154.000 Auto Top-off System Tunze Osmolator-3 3154.000 Auto Top-off System Tunze Osmolator-3 3154.000 Auto Top-off System

    Tunze

    Tunze Osmolator-3 3154.000 Auto Top-off System

    Tunze Osmolator-3 3154.000 Auto Top-off System Straightforward and safe water level controller for fresh and sea water with optical control sensor and independent thermal safety sensor. A constant water level keeps the salt concentration constant in...

    $229.99
  • Case (20 x 1.25 lbs.) DI Resin, Mixed Bed Color Changing Case (20 x 1.25 lbs.) DI Resin, Mixed Bed Color Changing Case (20 x 1.25 lbs.) DI Resin, Mixed Bed Color Changing

    AquaCave

    Case (20 x 1.25 lbs.) DI Resin, Mixed Bed Color Changing

    Case (20 x 1.25 lbs.) DI Resin, Mixed Bed Color Changing  ResinTech MBD-30 is a one-to-one volume mixture of CG8-H (a hydrogen form amber colored strong acid cation resin) and SBG1-OH-ID (a blue colored hydroxide form type 1 strong base anion resin)...

    Was: $269.95
    Now: $229.46
  • IceCap 200gpd RO/DI System IceCap 200gpd RO/DI System IceCap 200gpd RO/DI System IceCap 200gpd RO/DI System

    IceCap

    IceCap 200gpd RO/DI System

    IceCap 200gpd RO/DI System IceCap 4-Stage Reverse Osmosis Water Filtration Systems The IceCap RO/DI water filtration system is a four-stage reverse osmosis de-ionization filter system that efficiently removes up to 99% of tap water impurities. IceCap...

    $219.99
  • IM AUQA Gadget - HydroFill Ti - Reservoir - 15 Gallon IM AUQA Gadget - HydroFill Ti - Reservoir - 15 Gallon IM AUQA Gadget - HydroFill Ti - Reservoir - 15 Gallon

    Innovative Marine

    IM AUQA Gadget - HydroFill Ti - Reservoir - 15 Gallon

    IM AUQA Gadget - HydroFill Ti - Reservoir - 15 Gallon FEATURES: 15 Gallon Glass/Acrylic Hybrid Construction Weight: 36 lbs. Slide Out Refilling Drawer Compact Footprint (12.2" x 18.2" x 23.0") Corner Protectors Thumb screw drawer stop Floating water...

    $219.99
  • Neptune Systems DDR Dual Reservoir Neptune Systems DDR Dual Reservoir Neptune Systems DDR Dual Reservoir Neptune Systems DDR Dual Reservoir Neptune Systems DDR Dual Reservoir

    Neptune Systems

    Neptune Systems DDR Dual Reservoir

    Neptune Systems DDR Dual Reservoir This attractive fluid containment system stores your dosing fluids in style and even tells you when it’s time to refill! Each side stores two liters (2L) of fluid Connects directly to your DŌS Optical...

    $215.99
  • Red Sea Reef ATO+ System Red Sea Reef ATO+ System Red Sea Reef ATO+ System

    Red Sea

    Red Sea Reef ATO+ System

    Red Sea Reef ATO+ System The ReefATO+ is designed to maintain a stable salinity and water volume in a reef aquarium by automatically replenishing the water lost due to evaporation. In addition, the ReefATO+ provides two other critical aquarium health...

    $215.00
  • Milwaukee MW802 PRO 3-in-1 pH, EC, TDS Combo Meter with ATC Milwaukee MW802 PRO 3-in-1 pH, EC, TDS Combo Meter with ATC Milwaukee MW802 PRO 3-in-1 pH, EC, TDS Combo Meter with ATC Milwaukee MW802 PRO 3-in-1 pH, EC, TDS Combo Meter with ATC Milwaukee MW802 PRO 3-in-1 pH, EC, TDS Combo Meter with ATC

    Milwaukee Instruments

    Milwaukee MW802 PRO 3-in-1 pH, EC, TDS Combo Meter with ATC

    Milwaukee MW802 PRO 3-in-1 pH, EC, TDS Combo Meter with ATC DESCRIPTION This Milwaukee 3-in-1 combo meter allows you to measure pH, EC (conductivity) and TDS with a single meter and one single probe. WHAT PEOPLE ARE SAYING "Superb meter, easy to use,...

    $209.55
  • Tunze Osmolator 3155.000 Auto Top-off System Tunze Osmolator 3155.000 Auto Top-off System Tunze Osmolator 3155.000 Auto Top-off System Tunze Osmolator 3155.000 Auto Top-off System

    Tunze

    Tunze Osmolator 3155.000 Auto Top-off System

    Tunze Osmolator 3155 Water Level Regulation System with NEW Magnetic Bracket (3155.000) Water level regulator with two sensor holding devices, extension and numerous fastening accessories. It is suitable for use in cabinet filter plants, in Comline...

    Was: $229.99
    Now: $206.99
  • AutoAqua AWC Lite Auto Water Changer AutoAqua AWC Lite Auto Water Changer AutoAqua AWC Lite Auto Water Changer AutoAqua AWC Lite Auto Water Changer AutoAqua AWC Lite Auto Water Changer

    AutoAqua

    AutoAqua AWC Lite Auto Water Changer

    AutoAqua AWC Lite Auto Water Changer Innovative 2 in 1 Auto-Top-Off and Auto-Water-Change system achieves the aims of automatic tank maintenance. With precise and smooth DC Diaphragm pump, Smart AWC Lite is the ideal for any aquariums under 150 gallons...

    $199.99
  • Simplicity 10 Gallon Easy-Fill ATO Reservoir Simplicity 10 Gallon Easy-Fill ATO Reservoir Simplicity 10 Gallon Easy-Fill ATO Reservoir Simplicity 10 Gallon Easy-Fill ATO Reservoir Simplicity 10 Gallon Easy-Fill ATO Reservoir

    Simplicity

    Simplicity 10 Gallon Easy-Fill ATO Reservoir

    Simplicity 10 Gallon Easy-Fill ATO Reservoir The Simplicity Easy-Fill ATO Reservoir elevates and simplifies the water top-off routine. The patent-pending, wide-mouth lid converts to a funnel for easy refills, allowing users to spend less time on...

    $199.95
  • Trigger Systems Titanium ATO - 5 Gallon Trigger Systems Titanium ATO - 5 Gallon Trigger Systems Titanium ATO - 5 Gallon Trigger Systems Titanium ATO - 5 Gallon Trigger Systems Titanium ATO - 5 Gallon

    Trigger Systems

    Trigger Systems Titanium ATO - 5 Gallon

    Trigger Systems Titanium ATO - 5 Gallon Description Trigger Systems Titanium ATOs are one of the best looking ATOs on the market. They match perfectly to the Titanium line of sumps. These ATOs have built in LEDs along with a LED remote and a...

    Was: $229.99
    Now: $183.99
  • AutoAqua Smart ATO RO AutoAqua Smart ATO RO

    AutoAqua

    AutoAqua Smart ATO RO

    AutoAqua Smart ATO RO An ATO specially designed to fill the RO water reservoir from RO or RODI system directly. The kit comes with two duo sensors that provide double protection and avoid TDS creep.  The touch controller shows the operation...

    $181.49
  • Trigger System Triton ATO - 10 Gal. Trigger System Triton ATO - 10 Gal.

    Trigger Systems

    Trigger System Triton ATO - 10 Gal.

    Trigger System Triton ATO - 10 Gal. 10 Gallon ATO Dimensions: 10 long x 16″ wide x 15″ tall Matching color to Triton sumps: White bottom, Aquamarine sides and top, Smoke back 1/4″ hose quick disconnect port Recessed...

    Was: $218.99
    Now: $175.19
  • IceCap 100gpd RO/DI System IceCap 100gpd RO/DI System IceCap 100gpd RO/DI System IceCap 100gpd RO/DI System

    IceCap

    IceCap 100gpd RO/DI System

    IceCap 100gpd RO/DI System IceCap 4-Stage Reverse Osmosis Water Filtration Systems The IceCap RO/DI water filtration system is a four-stage reverse osmosis de-ionization filter system that efficiently removes up to 99% of tap water impurities. IceCap...

    $169.99
  •  Trigger Systems Sapphire ATO 10 Gallon Reservoir  Trigger Systems Sapphire ATO 10 Gallon Reservoir  Trigger Systems Sapphire ATO 10 Gallon Reservoir  Trigger Systems Sapphire ATO 10 Gallon Reservoir

    Trigger Systems

    Trigger Systems Sapphire ATO 10 Gallon Reservoir

    Trigger Systems Sapphire ATO 10 Gallon Reservoir Trigger Systems is proud to introduce matching Auto Top Off containers in 2 different size: 5 gallons and 10 gallons.   Features • Lid to prevent evaporation • Two 0.25” OD hose...

    Was: $209.99
    Now: $167.99
  • Trigger Systems Ruby ATO 10 Gallon Reservoir Trigger Systems Ruby ATO 10 Gallon Reservoir Trigger Systems Ruby ATO 10 Gallon Reservoir Trigger Systems Ruby ATO 10 Gallon Reservoir

    Trigger Systems

    Trigger Systems Ruby ATO 10 Gallon Reservoir

    Trigger Systems Ruby ATO 10 Gallon Reservoir Trigger Systems is proud to introduce matching Auto Top Off containers in 2 different size: 5 gallons and 10 gallons.   Features • Lid to prevent evaporation • Two 0.25” OD hose...

    Was: $209.99
    Now: $167.99
  • AutoAqua Smart ATO Lifter AutoAqua Smart ATO Lifter AutoAqua Smart ATO Lifter AutoAqua Smart ATO Lifter AutoAqua Smart ATO Lifter

    AutoAqua

    AutoAqua Smart ATO Lifter

    AutoAqua Smart ATO Lifter Premium Performance and Excellent Auto-Top-Off System The AutoAqua Smart ATO Lifter offers powerful performance and excellent auto-top-off functionality, with a silent AQUA Lifter Pump and a brand new ATO controller, ensuring...

    $159.99
  • Reef Factory Level keeper Auto Top Off System Reef Factory Level keeper Auto Top Off System

    Reef Factory

    Reef Factory Level keeper Auto Top Off System

    Reef Factory Level keeper Auto Top Off System An Auto Top Off System with Smart Features Remotely Manage Your Aquarium Water Level Track the History of Water Refills Receive Notifications of Issues Reduce Salinity Swings   Level keeper is a device...

    $155.99
  • AQUATECH 8800 RO Booster pump Kit AQUATECH 8800 RO Booster pump Kit AQUATECH 8800 RO Booster pump Kit

    AQUAFx

    AQUATECH 8800 RO Booster pump Kit

    AQUATECH 8800 RO Booster pump Assembly.Includes: * AquaTech 8800 booster pump, Model No: B851-2J03-B423 * Power transformer  * 40 psi pressure switch * 2 x 3/8" x 1/4" Jaco Reducers AQUATECH 8800 RO Booster pump Assembly.**** PRODUCT MANUAL...

    $149.95
  • Trigger Systems Crystal ATO 10 Gallon Reservoir Trigger Systems Crystal ATO 10 Gallon Reservoir Trigger Systems Crystal ATO 10 Gallon Reservoir

    Trigger Systems

    Trigger Systems Crystal ATO 10 Gallon Reservoir

    Trigger Systems Crystal ATO 10 Gallon Reservoir Trigger Systems is proud to introduce matching Auto Top Off containers in 2 different size: 5 gallons and 10 gallons.   Features • Lid to prevent evaporation • Two 0.25” OD hose...

    Was: $179.99
    Now: $143.99
  • IM AUQA Gadget - HydroFill Ti - Reservoir - 5 Gallon IM AUQA Gadget - HydroFill Ti - Reservoir - 5 Gallon IM AUQA Gadget - HydroFill Ti - Reservoir - 5 Gallon IM AUQA Gadget - HydroFill Ti - Reservoir - 5 Gallon IM AUQA Gadget - HydroFill Ti - Reservoir - 5 Gallon

    Innovative Marine

    IM AUQA Gadget - HydroFill Ti - Reservoir - 5 Gallon

    IM AUQA Gadget - HydroFill Ti - Reservoir - 5 Gallon FEATURES: 5 Gallon Glass/Acrylic Hybrid Construction Slide Out Refilling Drawer Compact Footprint (8.1" x 11.5" x 20.3") Corner Protectors Thumb screw drawer stop Floating water line indicator Rear...

    $142.99
  • Simplicity 5 Gallon Easy-Fill ATO ReservoirDP-SIM-ATO Simplicity 5 Gallon Easy-Fill ATO ReservoirDP-SIM-ATO Simplicity 5 Gallon Easy-Fill ATO ReservoirDP-SIM-ATO Simplicity 5 Gallon Easy-Fill ATO ReservoirDP-SIM-ATO Simplicity 5 Gallon Easy-Fill ATO Reservoir

    Simplicity

    Simplicity 5 Gallon Easy-Fill ATO Reservoir

    Simplicity 5 Gallon Easy-Fill ATO ReservoirDP-SIM-ATO The Simplicity Easy-Fill ATO Reservoir elevates and simplifies the water top-off routine. The patent-pending, wide-mouth lid converts to a funnel for easy refills, allowing users to spend less time...

    $139.95
  • Icecap ATO Top-off Icecap ATO Top-off Icecap ATO Top-off Icecap ATO Top-off

    IceCap

    Icecap ATO Top-off

    Icecap ATO Top-off The IceCap ATO is a reliable dual optical sensor Auto Top Off management system that monitors and automates refilling evaporated water. Includes everything needed to install and operate. SAFELY KEEP WATER & SALINITY LEVELS...

    $139.69
  • Eshopps Dosing Container 5.0, 5 x 2 liter Chambers Eshopps Dosing Container 5.0, 5 x 2 liter Chambers

    Eshopps

    Eshopps Dosing Container 5.0, 5 x 2 liter Chambers

    Eshopps Dosing Container 5.0, 5 x 2 liter Chambers Specifications: Item: 15814 Dimensions:; 15"L x 5"W x 12"H 5 x 2 Liter Eshopps Dosing Container 5.0, 5 x 2 liter Chambers Specifications: Item: 15814 Dimensions:; 15"L x 5"W x 12"H 5 x 2...

    $129.95
  • Trigger System Triton ATO - 5 Gal. Trigger System Triton ATO - 5 Gal. Trigger System Triton ATO - 5 Gal.

    Trigger Systems

    Trigger System Triton ATO - 5 Gal.

    Trigger System Triton ATO - 5 Gal. 5 Gallon ATO Dimensions: 6″ long x 14″ wide x 15″ tall Matching color to Triton sumps: White bottom, Aquamarine sides and top, Smoke back 1/4″ hose quick disconnect port Recessed...

    Was: $154.99
    Now: $123.99
  • Complete Drinking Water Kit

    AQUAFx

    Complete Drinking Water Kit

    Add drinking water to your current RO or RO/DI system...Add drinking water to your current RO or RO/DI system. * A wonderful addition to any of our systems * Provides drinking, cooking, and water for your ice machine too * Imagine clear ice, no more...

    $119.95
  •  Pinpoint Conductivity Monitor

    Pinpoint - American Marine

    Pinpoint Conductivity Monitor

    Pinpoint Conductivity Monitor by American MarinePINPOINT Conductivity Monitor™ is an instrument for the measurement of hardness in freshwater. The conversions are 33 µS=17.9 ppm=1dH. Good quality reverse osmosis water measures 5–15...

    $117.95
  •  Trigger Systems Sapphire ATO 5 Gallon Reservoir  Trigger Systems Sapphire ATO 5 Gallon Reservoir  Trigger Systems Sapphire ATO 5 Gallon Reservoir

    Trigger Systems

    Trigger Systems Sapphire ATO 5 Gallon Reservoir

    Trigger Systems Sapphire ATO 5 Gallon Reservoir Trigger Systems is proud to introduce matching Auto Top Off containers in 2 different size: 5 gallons and 10 gallons.   Features • Lid to prevent evaporation • Two 0.25” OD hose...

    Was: $144.99
    Now: $115.99
  • Trigger Systems Ruby ATO 5 Gallon Reservoir Trigger Systems Ruby ATO 5 Gallon Reservoir Trigger Systems Ruby ATO 5 Gallon Reservoir Trigger Systems Ruby ATO 5 Gallon Reservoir

    Trigger Systems

    Trigger Systems Ruby ATO 5 Gallon Reservoir

    Trigger Systems Ruby ATO 5 Gallon Reservoir Trigger Systems is proud to introduce matching Auto Top Off containers in 2 different size: 5 gallons and 10 gallons.   Features • Lid to prevent evaporation • Two 0.25” OD hose...

    Was: $144.99
    Now: $115.99
  • JBJ NANO Auto Top-off water level controller JBJ NANO Auto Top-off water level controller JBJ NANO Auto Top-off water level controller JBJ NANO Auto Top-off water level controller JBJ NANO Auto Top-off water level controller

    JBJ NANO Auto Top-off water level controller

    The JBJ Nano ATO is the perfect upgrade for smaller aquariums. JBJ`s most reliable auto-top-off system has been reimagined with dual optical level-sensors for ultimate precision. Enjoy the compact versatility of a digital sensor without compromising the...

    $109.00
60 of 189 Items