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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.

  • ReefBreeders ATO ReefBreeders ATO

    ReefBreeders

    ReefBreeders ATO

    ReefBreeders ATO Dive into a new era of aquarium care with the ReefBreeders ATO 2023 Model, where sophistication harmonizes with advanced functionality! The ReefBreeders ATO symbolizes the zenith of aquarium care innovation. With enhanced features,...

    $119.99
  • Tunze Osmolator Nano 3152.000 Auto Top-off System Tunze Osmolator Nano 3152.000 Auto Top-off System Tunze Osmolator Nano 3152.000 Auto Top-off System Tunze Osmolator Nano 3152.000 Auto Top-off System

    Tunze

    Tunze Osmolator Nano 3152.000 Auto Top-off System

    Tunze Osmolator NANO, Water Level Regulation System (3152.000)  Water level controller with only one sensor for nano aquariums or small aquariums with up to 200 liters (55 USgal.). Can be installed in a cabinet filter or directly on the...

    Was: $149.99
    Now: $119.99
  • 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
  • IceCap ATO EZ Automatic Top-off System IceCap ATO EZ Automatic Top-off System IceCap ATO EZ Automatic Top-off System IceCap ATO EZ Automatic Top-off System IceCap ATO EZ Automatic Top-off System

    IceCap

    IceCap ATO EZ Automatic Top-off System

    IceCap ATO EZ Automatic Top-off System Water Pump Specifications Brushless DC Water Pump (30000hrs) Dimensions: 1.5 x 1.5 x 1.5in Maximum Head: ~6ft Flow Rate: 50gph Power: 5w Tubing Size: ID 6.5mm/OD 8mm/6ft The IceCap ATO EZ is a reliable...

    $109.71
  • 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
  • Tunze High Jet with power supply Tunze High Jet with power supply Tunze High Jet with power supply Tunze High Jet with power supply Tunze High Jet with power supply

    Tunze

    Tunze High Jet with Power Supply

    Tunze High Jet with power supply The Turbelle® High Jet is a replacement dosing pump with safety extra low voltage 12 V DC for Osmolator® nano 3152 and Osmolator® 3155 and belongs to a new generation of centrifugal pumps with...

    $99.99
  • AQUAFx Dolphin 3 Stage RO System

    AQUAFx

    AQUAFx Dolphin 3 Stage RO System

    The Dolphin is a 3-stage reverse osmosis unit. The standard unit comes with 1-micron sediment filtration, a carbon block for VOC reduction and a DOW membrane.The Dolphin is a 3-stage reverse osmosis unit. The standard unit comes with 1-micron sediment...

    MSRP: $149.95
    $99.95
  • Simplicity Dosing Container- 3 x 2 Liter Simplicity Dosing Container- 3 x 2 Liter

    Simplicity

    Simplicity Dosing Container- 3 x 2 Liter

    Simplicity Dosing Container- 3 x 2 Liter The new Simplicity Dosing Container is a compact vessel that holds a lot more of your Ca/Alk/Mg than you would think by looking at it.  (W4.3/4 x L9x11 3/4" x H7 7/8)  Holds 2 liters x 3 Sensor...

    $99.95
  • IM AUQA Gadget - HydroFill Ti - ATO Controller IM AUQA Gadget - HydroFill Ti - ATO Controller IM AUQA Gadget - HydroFill Ti - ATO Controller IM AUQA Gadget - HydroFill Ti - ATO Controller IM AUQA Gadget - HydroFill Ti - ATO Controller

    Innovative Marine

    IM AUQA Gadget - HydroFill Ti - ATO Controller

    IM AUQA Gadget - HydroFill Ti - ATO Controller CONTROLLER: 1 Year Warranty Conductivity Method For use in Fresh & Marine Applications Controller Dims: 3.35" x 1.18" x 5.12" Includes Double Sided Adhesive 1000W, 8Amp/120V Pump Capacity Power...

    $93.00
  • IM AUQA Gadget - HydroFill Ti - Pump IM AUQA Gadget - HydroFill Ti - Pump IM AUQA Gadget - HydroFill Ti - Pump IM AUQA Gadget - HydroFill Ti - Pump IM AUQA Gadget - HydroFill Ti - Pump

    Innovative Marine

    IM AUQA Gadget - HydroFill Ti - Pump

    IM AUQA Gadget - HydroFill Ti - Pump FEATURES:PUMP: Positive Displacement 1 Year Warranty Diaphragm Pump Method Self-Priming Built-in Check valve Dry Run Protection Thermally Protected Low Voltage 1/4" barb fitting Up to 15 Gallons per Hour Pump...

    $93.00
  • Liquid Storage Dosing Container 3 x 1.5 Liters Liquid Storage Dosing Container 3 x 1.5 Liters Liquid Storage Dosing Container 3 x 1.5 Liters Liquid Storage Dosing Container 3 x 1.5 Liters Liquid Storage Dosing Container 3 x 1.5 Liters

    AquaCave

    Liquid Storage Dosing Container 3 x 1.5 Liters

    Liquid Storage Dosing Container 3 x 1.5 Liters 12.5 x 4.3 x 7” 3x1.5 Liters Liquid Storage Container Dosing Reservoir Excellent for your aquarium Liquid Storage Dosing Container 3 x 1.5 Liters 12.5 x 4.3 x 7” 3x1.5...

    $89.99
  • Tunze Turbelle High Jet Tunze Turbelle High Jet Tunze Turbelle High Jet

    Tunze

    Tunze Turbelle High Jet

    Tunze Turbelle High Jet The Turbelle® High Jet is a replacement dosing pump with safety extra low voltage 12 V DC for Osmolator® nano 3152 and Osmolator® 3155 and belongs to a new generation of centrifugal pumps with a high delivery height and small...

    $84.99
  • Simplicity Modular Dosing Container, 5 Liters Simplicity Modular Dosing Container, 5 Liters Simplicity Modular Dosing Container, 5 Liters Simplicity Modular Dosing Container, 5 Liters Simplicity Modular Dosing Container, 5 Liters

    Simplicity

    Simplicity Modular Dosing Container, 5 Liters

    Simplicity Modular Dosing Container, 5 Liters Modular design with built-in connections for easy expansion 5L high-capacity compartment Easy-to-read graduations, oz/ml The tight-fitting lid stays in place without creating a vacuum Durable hose...

    $74.95
  • 4 Stage RO/DI Filter Set 4 Stage RO/DI Filter Set 4 Stage RO/DI Filter Set 4 Stage RO/DI Filter Set 4 Stage RO/DI Filter Set

    AquaCave

    4 Stage RO/DI Filter Set

    4 stage RO/DI Filter Set. Fit most stondard 10" RO/DI units. Recommended replacement time is 4-6 months. 1 Sediment Filter 1 Carbon Block ( Matrikx +CTO Carbon Block Filter 5 micron) 2 DI Cartridges 4 stage RO/DI Filter Set. Fit most...

    $69.99
  • CoralVue 12V Electronic Top-off Float Switch CoralVue 12V Electronic Top-off Float Switch

    CoralVue

    CoralVue 12V Electronic Top-off Float Switch

    CoralVue Electronic Top-off Float Switch uses a powerhead or pump (user supplied) to keep a constant level in a sump.The New CoralVue Electronic Auto Top-off Unit comes complete with; float switch, pump, hose, and mounting bracket. The unit uses a pump...

    $69.99
  • NH2CL (Chloramine) Blaster Upgrade Kit NH2CL (Chloramine) Blaster Upgrade Kit

    AQUAFx

    NH2CL (Chloramine) Blaster Upgrade Kit

    A standard carbon block works well to remove chlorine, however, more and more municipalities are adding ammonia to the water treatment processes to stabalize the chlorine from releasing harmful by-products into the water...A standard carbon block works...

    $69.95
  • AutoAqua Digital Inline TDS - Titanium S3 AutoAqua Digital Inline TDS - Titanium S3

    AutoAqua

    AutoAqua Digital Inline TDS - Titanium S3

    AutoAqua Digital Inline TDS - Titanium S3 Are you tired of big, boxy, hard-to-read TDS meters? So are we! That’s why we built the AutoAqua Titanium Series TDS meters. They are small, easy-to-use, and have a big bright screen to make checking your...

    $59.99
  • IceCap Dual DI Filter Canister IceCap Dual DI Filter Canister IceCap Dual DI Filter Canister IceCap Dual DI Filter Canister

    IceCap

    IceCap Dual DI Filter Canister

    IceCap Dual DI Filter Canister  The IceCap Dual Stage DI systems are designed to effectively treat filtered water before using it in your aquarium. The Dual DI stage filter helps remove excessive amounts of TDS and contaminants like ammonia,...

    $59.99
  • Magnetic RODI/ATO Safety Float - ReefBreeders Magnetic RODI/ATO Safety Float - ReefBreeders

    ReefBreeders

    Magnetic RODI/ATO Safety Float - ReefBreeders

    Magnetic RODI/ATO Safety Float - ReefBreeders The new Coral Box N30 ATO fits standard 1/4″ RODI tubing, and includes an adapter to fit the tubing included with all of our Auto Top Off systems. These include a sturdy magnet mount that works with glass...

    $59.99
  • Practical Multi-purpose Utility Pump v2 - Neptune Systems

    Neptune Systems

    Practical Multi-purpose Utility Pump v2 - Neptune Systems

    Practical Multi-purpose Utility Pump v2 - Neptune Systems The PMUP is a 24VDC submersible pump that was designed to directly connect to the DC24 accessory ports on either the 1Link module OR the same ports on the new Energy Bar 832.  If you own our...

    $59.99
  • Smart AC Switch (Compatible with AWC & ATO) Smart AC Switch (Compatible with AWC & ATO)

    AutoAqua

    Smart AC Switch (Compatible with AWC & ATO)

    Smart AC Switch (Compatible with AWC & ATO) Smart AC Socket is a simple accessory from AutoAqua that allows the use to swap out the small DC pump on a Smart ATO, Smart ATO Micro or AWC to any AC pump under 9amps power draw.

    $59.99
  • Spectra Pure MaxCap Super DI Cartridge (DI-MC-10HC) Spectra Pure MaxCap Super DI Cartridge (DI-MC-10HC)

    SpectraPure

    Spectra Pure MaxCap Super DI Cartridge (DI-MC-10HC)

    Spectra Pure MaxCap Super DI Cartridge (DI-MC-10HC)SpectraPure, Inc. Revolutionary MaxCap DI cartridge has over 3 times more capacity than any other Mixed-Bed or Hi-Silica removal deionizing cartridge. When placed upstream of your existing DI cartridge,...

    $59.99
  • Add-On DI Filter Add-On DI Filter

    AQUAFx

    Add-On DI Filter

    Add-On DI Filter Add On a 10 X 2 inch or 20 X 2 inch DI Filter  This Add On DI can be used with most RO units or used alone. 18 meg water at your fingertips! The unit come filled with: Nuclear grade, virgin, color indicating...

    $59.95
  • Piggy Back RO Membrane

    AQUAFx

    Piggy Back RO Membrane

    Double your output! Add 2 and Triple your output!...Double your output! Add 2 and Triple your output! Includes: * 100 GPD {DOW -75} Reverse Osmosis Membrane * Membrane Housing w/ Clips * Tee's w/ 1 piggy back, Crosses w/ 2 piggy backs * TubingProduct...

    $59.95
  • 150 GPD Reverse Osmosis Membrane CSM RE2012-LPF 150 GPD Reverse Osmosis Membrane CSM RE2012-LPF

    CSM

    150 GPD Reverse Osmosis Membrane CSM RE2012-LPF

    150 GPD Reverse Osmosis Membrane CSM RE2012-LPF We recommend flushing for 5 minutes to prevent earlier clogging.The first full tank of permeate should be discard. Do not use this initial permeate for drinking water of food preparation.Keep elements...

    $54.99
  • 4-Stage RO/DI Filter Set 4-Stage RO/DI Filter Set 4-Stage RO/DI Filter Set 4-Stage RO/DI Filter Set

    AquaCave

    4-Stage RO/DI Filter Set

    4 stage RO/DI Filter Set Fit most standard 10" RO/DI units. Recommended replacement time is 4-6 months. * 1 Sediment Filter* 1 Carbon Block (Matrikx +CTO Carbon Block Filter 5 micron)* 2 x 1.25 lb. color-changing DI resin 4 stage RO/DI Filter Set. Fit...

    $54.99
  •  100 GPD Reverse Osmosis Membrane - LG Chem LGTWRO  100 GPD Reverse Osmosis Membrane - LG Chem LGTWRO  100 GPD Reverse Osmosis Membrane - LG Chem LGTWRO  100 GPD Reverse Osmosis Membrane - LG Chem LGTWRO

    CSM

    100 GPD Reverse Osmosis Membrane - LG Chem LGTWRO

    ****Fits most standard 10" RO & RO/DI Systems including Vertex, KENT, CoraLife, Seachem, AquaFx, SpectraPure.****  100 GPD Reverse Osmosis Membrane - LG Chem LGTWRO 100 GPD membrane features a 98% rejection rate at 50 PSI which makes it...

    $49.99
  • 4.4 Gal RO Pressure Tank

    AQUAFx

    4 Gal RO Pressure Tank

    4 Gal RO Pressure Tank.Pre-pressurised bladder tanks. Pressured bladder tanks have several advantages over atmospheric tanks. Pressurized tanks do not require any delivery pump and are less likely to have microbial contamination versus atmospheric tanks...

    $49.99
  • Neptune Systems SV1 Solenoid Valve Neptune Systems SV1 Solenoid Valve Neptune Systems SV1 Solenoid Valve Neptune Systems SV1 Solenoid Valve

    Neptune Systems

    Neptune Systems SV1 Solenoid Valve

    Neptune Systems SV1 Solenoid Valve Perfect for controlling your RODI system, top off system, calcium reactor, or other low flow items that use 1/4" tubing. The solenoid valves uses the 24V accessory port found on 1Link modules and the EnergyBar 832...

    $49.99
  • HM Digital Triple In-Line TDS Monitor

    HM Digital Triple In-Line TDS Monitor

    Dual Inline TDS Meter Measure the tap water coming in vs. the purified water going out of your system at any time. Use the monitor to determine when the filters need to be changed. Install the meter for your customers so they'll always know how their...

    $49.95
  • AutoAqua Digital Inline TDS - Titanium S2 AutoAqua Digital Inline TDS - Titanium S2

    AutoAqua

    AutoAqua Digital Inline TDS - Titanium S2

    AutoAqua Digital Inline TDS - Titanium S2 Are you tired of big, boxy, hard-to-read TDS meters? So are we! That’s why we built the AutoAqua Titanium Series TDS meters. They are small, easy-to-use, and have a big bright screen to make checking your...

    $47.99
  • 3 stage RO/DI Filter Set 3 stage RO/DI Filter Set 3 stage RO/DI Filter Set 3 stage RO/DI Filter Set

    AquaCave

    3 stage RO/DI Filter Set

    3 stage RO/DI Filter Set. Fit most stondard 10" RO/DI units. Recommended replacement time is 4-6 months. * 1 Sediment Filter * 1 Carbon Block (Matrikx +CTO Carbon Block Filter 5 micron) * 1 DI filter (color changing resin)3 stage RO/DI Filter Set...

    $46.99
  •  75 GPD Reverse Osmosis Membrane CSM RE1812  75 GPD Reverse Osmosis Membrane CSM RE1812

    AQUAFx

    75 GPD Reverse Osmosis Membrane CSM RE1812

    ****Fits most standard 10" RO & RO/DI Systems including KENT, CoraLife, Seachem, AquaFx, SpectraPure.****  75 GPD Reverse Osmosis Membrane CSM RE1812We recommend flushing for 5 minutes to prevent earlier clogging.The first full tank of permeate...

    $44.99
  • IceCap Magnet Mount Float Valve IceCap Magnet Mount Float Valve

    IceCap

    IceCap Magnet Mount Float Valve

    IceCap Magnet Mount Float Valve IceCap Magnetic Mount Float Valve comes with universal tubing retainer and tubing IceCap Magnetic Mount Float Valve come makes it easy to add a layer of redundancy for additional security in case something fails. Once...

    $40.41
  • 50 GPD Reverse Osmosis Membrane 50 GPD Reverse Osmosis Membrane 50 GPD Reverse Osmosis Membrane 50 GPD Reverse Osmosis Membrane

    CSM

    50 GPD Reverse Osmosis Membrane

    ****Fits most standard 10" RO & RO/DI Systems including KENT, CoraLife, Seachem, AquaFx, SpectraPure.****We recommend flushing for 5 minutes to prevent earlier clogging.The first full tank of permeate should be discard. Do not use this initial...

    $39.99
  • IceCap Reverse Osmosis Canister IceCap Reverse Osmosis Canister IceCap Reverse Osmosis Canister

    IceCap

    IceCap Reverse Osmosis Canister

    IceCap Reverse Osmosis Canister 10in Reverse Osmosis Canister with ¼in NPT Ports. This RO canister holds standard 10” cartridges and filters ¼in NPT Ports Dual Oring Seals Clear/Blue Color Height 11" 1/2"  IceCap...

    $39.95
  • Sea Side Aquatics Magnetic Float Switch Sea Side Aquatics Magnetic Float Switch Sea Side Aquatics Magnetic Float Switch Sea Side Aquatics Magnetic Float Switch

    Seaside

    Sea Side Aquatics Magnetic Float Switch

    Sea Side Aquatics Magnetic Float Switch Magnetic Float Switch Sensor Super strong magnet accommodates glass up to 3/4" thick  Sea Side Aquatics Magnetic Float Switch Magnetic Float Switch Sensor Super strong magnet accommodates glass up to...

    $39.95
  • Simplicity Modular Dosing Container, 2 Liters Simplicity Modular Dosing Container, 2 Liters Simplicity Modular Dosing Container, 2 Liters

    Simplicity

    Simplicity Modular Dosing Container, 2 Liters

    Simplicity Modular Dosing Container, 2 Liters Dimensions: (4.5" X 4.8" X 8.5")   Modular design with built-in connections for easy expansion 2L high-capacity compartment Easy-to-read graduations, oz/ml The tight-fitting lid stays in place...

    $39.95
  • 3-stage RO/DI Filter Set 3-stage RO/DI Filter Set 3-stage RO/DI Filter Set 3-stage RO/DI Filter Set

    AquaCave

    3-stage RO/DI Filter Set

    3 stage RO/DI Filter Set. Fit most standard 10" RO/DI units. Recommended replacement time is 4-6 months.* 1 Sediment Filter* 1 Carbon Block (Matrikx +CTO Carbon Block Filter 5 micron)* 1 x 1.25 lb. color-changing DI resin3 stage RO/DI Filter Set. Fit...

    $38.99
  • Smart ATO DC Refill Pump Smart ATO DC Refill Pump

    AutoAqua

    Smart ATO DC Refill Pump

    Smart ATO DC Refill Pump The Auto Aqua Smart ATO direct current 12v brushless DC pump connects directly to the "pump DC jack" on the Smart ATO controller. Used to supply fresh top off water to the aquarium up to 78 inches.Smart ATO DC Refill Pump The...

    $38.99
  • Smart ATO Solenoid for Reverse Osmosis

    AutoAqua

    Smart ATO Solenoid for Reverse Osmosis

    Smart ATO Solenoid for Reverse Osmosis The Auto Aqua solenoid switch will safety provide a fill source for most Reverse Osmosis systems equipped with a pressure shut off switch. Simply attach the solenoid to the product line coming off of your RO system...

    $38.99
  • AutoAqua Digital Inline TDS - Titanium One AutoAqua Digital Inline TDS - Titanium One

    AutoAqua

    AutoAqua Digital Inline TDS - Titanium One

    AutoAqua Digital Inline TDS - Titanium One Are you tired of big, boxy, hard-to-read TDS meters? So are we! That’s why we built the AutoAqua Titanium Series TDS meters. They are small, easy-to-use, and have a big bright screen to make checking your...

    $35.99