Marine and reef use
Salt-Mix Preparation and Top-Off
Use purified RO/DI water as the base for a suitable marine salt mix or for replacing evaporated water according to the aquarium’s established maintenance procedure.
4-Stage Countertop Aquarium RO/DI System — 75 or 150 GPD Membrane, DI/T33 Polishing Filter — SKU 001-AQUA2
Price range: $119.00 through $209.00
4-stage Aquarium Countertop Reverse Osmosis Water Purification System, 75 or 150 GPD RO Membrane. SKU# 001-AQUA2
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Description
Portable aquarium RO/DI water production
4-stage countertop reverse-osmosis system for freshwater and saltwater aquariums
This compact countertop RO/DI system connects to a compatible faucet or utility-water outlet without permanent under-sink installation. It combines sediment filtration, coconut-shell carbon, a high-rejection TFC membrane, and a mixed-bed DI/T33 polishing cartridge to produce low-mineral water for aquarium mixing, top-off, and controlled remineralization.
4 stagesSediment, carbon, RO and DI/T33
75 or 150 GPDTwo membrane-output options
11–22 minApproximate time per gallon
1:2.4Approximate pure-to-drain ratio
Designed for aquarium preparation
Create a controlled starting point for freshwater and marine water
Reverse osmosis helps reduce dissolved minerals, nitrate, phosphate, metals, fluoride, and other membrane-rejectable substances. The final mixed-bed DI stage further polishes residual ions, helping aquarists start with lower-TDS water before adding marine salt mix or freshwater remineralization products.
Freshwater use
Controlled Remineralization
Blend with suitable source water or add a species-appropriate remineralization product to reach the desired GH, KH, pH, and conductivity.
Four filtration stages
Protection, membrane separation, and final ionic polishing
1
5-Micron Sediment
Helps capture rust, sand, dirt, and other suspended particles before they reach the carbon filter and RO membrane.
2
Coconut-Shell Carbon
Helps reduce chlorine, taste, odor, and selected organic compounds that could affect the membrane or aquarium water quality.
3
TFC RO Membrane
Helps reduce dissolved salts, hardness minerals, nitrate, phosphate, fluoride, metals, and many other dissolved constituents.
4
Mixed-Bed DI + T33
The listed polishing cartridge contains approximately two-thirds DI media and one-third T33 carbon for additional ionic and taste polishing.
Why RO/DI for aquariums
Reduce source-water variability before adjusting aquarium parameters
Lower Dissolved Minerals
Helps reduce source-water hardness, conductivity, and dissolved solids.
Nitrate Reduction
RO and DI stages help reduce nitrate from source water before it enters the aquarium.
Phosphate Reduction
Helps reduce source-water phosphate that can contribute to nuisance algae.
Chlorine Pretreatment
The carbon stage helps protect the membrane from chlorine and improves feed-water quality.
Final Ion Polishing
Mixed-bed DI resin further reduces ions that pass through the RO membrane.
Portable Countertop Use
No dedicated storage tank, drain saddle, or permanent under-sink installation is required.
Output options
Choose 75 or 150 GPD based on collection speed
Actual production depends on water pressure, water temperature, source-water TDS, membrane condition, and flow-restrictor configuration.
Produces approximately one gallon in 22 minutes under suitable conditions, or about 2.5–3 gallons per hour.
Produces approximately one gallon in 11 minutes under suitable conditions, or about 5–6 gallons per hour.
The GPD rating is a standardized membrane rating, not guaranteed household output. Low pressure, cold water, high TDS, and an aging membrane reduce production.
Aquarium-use guidance
RO/DI water usually needs adjustment before freshwater use
Method 1
Blend RO/DI with Suitable Source Water
Some aquarists blend purified water with tested source water to reach the target hardness and pH. The correct ratio depends on both water sources and the aquarium species.
Method 2
Use 100% RO/DI and Remineralize
Add a commercial marine salt or freshwater remineralization product according to the manufacturer’s instructions and verify the resulting parameters before use.
Do not make sudden changes to GH, KH, pH, salinity, or conductivity in an established aquarium. Transition gradually through controlled partial water changes and test the prepared water before adding it to the tank.
Connection options
Select the adapter that matches your cold-water outlet
STD
Standard Kitchen Faucet
Designed for faucets with a removable aerator and compatible male or female aerator threads.
3/4
Garden or Laundry Outlet
Uses a compatible 3/4″ garden-hose-thread adapter for a utility sink, washer outlet, or outdoor cold-water connection.
PULL
Pull-Down or Sprayer Faucet
Requires a special adapter. Compatibility is limited because pull-down faucet threads are not standardized.
OTHER
Bathroom or Shower Connection
Other adapters may be available for bathroom faucets, shower arms, or handheld-shower connections.
Specifications
Verified system details
| Product type | Portable 4-stage countertop aquarium RO/DI system |
|---|---|
| Membrane options | 75 GPD or 150 GPD TFC RO membrane |
| Stage 1 | 5-micron quick-connect sediment filter |
| Stage 2 | T28 coconut-shell activated carbon prefilter |
| Stage 3 | High-rejection TFC reverse-osmosis membrane |
| Stage 4 | Combined polishing cartridge with approximately 2/3 mixed-bed DI media and 1/3 T33 carbon |
| Approximate production | 1 gallon in 11–22 minutes; approximately 3–6 gallons per hour |
| Approximate water ratio | 1 part purified water to approximately 2.4 parts drain water |
| Recommended source pressure | Minimum approximately 40 PSI; better output at 55–60 PSI or higher |
| Water temperature | Cold water only |
| Listed assembled dimensions | Approximately 14 × 6 × 6 in |
| Listed shipping dimensions | 16 × 8 × 8 in |
| Listed shipping weight | 96 oz / 6 lb |
| Filter life | Up to approximately 12 months or 1,000 gallons, depending on source water and usage |
| Membrane life | Approximately 24–36 months, depending on rejection, pressure, source water, and prefilter maintenance |
| SKU | 001-AQUA2 |
| Compatible SKU noted on page | 001-AQUA2 and 001-AQUA3 |
Package contents
- ✓Complete four-stage countertop aquarium RO/DI system
- ✓Preinstalled sediment, carbon, membrane, and DI/T33 cartridges
- ✓Selected 75 or 150 GPD membrane
- ✓Selected faucet or utility-outlet adapter
- ✓Tubing and required system connections
- ✓Operating manual
What to expect
Test actual water quality instead of relying on a fixed TDS claim
Flush new sediment, carbon, membrane, and DI/T33 stages before aquarium use. Do not evaluate final TDS immediately after installation.
Monitor post-DI TDS or conductivity. Replace the polishing cartridge when the value rises beyond your aquarium target or the resin is exhausted.
The old page lists 0–6 ppm as an expected range, but actual post-DI TDS depends on source water, membrane rejection, DI capacity, flow, and cartridge condition. A fixed result cannot be guaranteed.
Filter replacement
Replace filters according to water quality, usage, and test results
Replace approximately every 8–12 months or sooner when pressure, flow, chlorine breakthrough, TDS, conductivity, or water quality indicates exhaustion.
Replace approximately every 24–36 months, or when measured rejection declines below the level needed for the aquarium.
Before purchase
Good to know
!
RO/DI water lacks aquarium minerals
Freshwater systems generally require controlled remineralization or blending before use.
Freshwater systems generally require controlled remineralization or blending before use.
!
Test before adding water
Verify TDS, conductivity, GH, KH, pH, temperature, and salinity as applicable.
Verify TDS, conductivity, GH, KH, pH, temperature, and salinity as applicable.
!
Output is not faucet-fast
Collect water in advance. Countertop RO produces a slow purified stream by design.
Collect water in advance. Countertop RO produces a slow purified stream by design.
!
RO creates drain water
Plan for approximately 2.4 gallons of concentrate water per gallon of purified water produced.
Plan for approximately 2.4 gallons of concentrate water per gallon of purified water produced.
!
Pull-down compatibility is limited
Special adapters fit only some sprayer and pull-down faucets because thread patterns vary.
Special adapters fit only some sprayer and pull-down faucets because thread patterns vary.
!
Not a microbiological purifier
Do not use microbiologically unsafe or unknown-quality water without suitable upstream disinfection.
Do not use microbiologically unsafe or unknown-quality water without suitable upstream disinfection.
Contaminant-reduction performance depends on source-water chemistry, pressure, temperature, membrane condition, cartridge condition, flow, and maintenance. This system does not guarantee a specific final TDS, nitrate concentration, pH, GH, KH, conductivity, or salinity.
Not sure whether to choose 75 or 150 GPD?
Send the aquarium size, weekly water-change volume, source-water TDS, water pressure, faucet photos, and target water parameters.
Send the aquarium size, weekly water-change volume, source-water TDS, water pressure, faucet photos, and target water parameters.
Additional information
| Weight | 96 oz |
|---|---|
| Dimensions | 16 × 8 × 8 in |
| Membrane | 150 Gallons per day, 75 Gallons per day |
| Replacement | Basic RO plus 2 extra filter sets (extra 2 Year Supply), Basic RO System |
| Connection | Standard Kitchen faucet, Garden/laundry utility outlet, Pulldown/sprinkler type kitchen faucet, Other Connection (you can specify later) |
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