3 Best HydroLogic Stealth RO 300 Reviews of 2022

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If you are in search of safe, healthy, and great-tasting water for your home, getting the best reverse osmosis system is a great way to start.

A reverse osmosis system helps remove a wide range of harmful contaminants from the water, thus a worthy investment.

And although there are numerous brands of RO systems in the market, we narrow our search to systems from HydroLogic Purification Systems.

The brand is popular for its simple but high-quality and eco-friendly reverse osmosis systems.

From HydroLogic Purification Systems, you can get a system for gardening, hydroponics, residential and commercial applications.

This article breaks down the features of the top 3 best HydroLogic Stealth 300 RO systems to help you get the best device for your home.

Our Top Picks

This system filters up to 98% of harmful water contaminants, produces up to 300 GPD, has a maximum feed flow of 2 GPM, comes with an automatic shut-off cartridge, mountable metal bracket, long-lasting filters, and is easy to install.

A system that filters water in 3 stages, has a cleanable sediment filter, produces up to 300 GPD, has a waste water ratio of 2:1, optional 1:1 ratio flow restrictor, customizable for hydroponics and gardening, measures 6.2 x16x 18.5 inches, and weighs 12.5 pounds.

The system produces 200 GPD, measures 19 x 16.5 x 18.5 inches, weighs 8.6 pounds, 2:1 waste water ratio, filters water in 3 stages, wastes 25% less water than other RO systems, and is easy to install and replace filters.

Picking the Best HydroLogic Stealth 300 RO Systems

1. HydroLogic 31040 Stealth RO300 Reverse Osmosis

HydroLogic 31040 Stealth RO300

Use the HydroLogic 31040 Stealth to filter your tap water, and you’ll notice an immediate improvement in the water quality.

The unit is designed more for drinking and cooking water than anything else, and it does the role very well. It filters up to 98% of chlorine and other harmful contaminants from the water.

Worried that the system might waste a lot of water during the water filtration process? Well, that isn’t the case. It can produce 200 gallons of ultra-pure water per day, wasting about 25% less waste water than other RO systems.

It produces up to 300 gallons of water per day and has a maximum feed flow of 2 GPM.

The HydroLogic 31040 offers an automatic shut-off cartridge that enables you to reduce water use. It also comes with a pressure gauge that allows you to monitor filter pressure in real time.

And did you know that the system can mount anywhere now that it comes with a wall bracket? Whether to install it under the sink, in the bathroom, or basement, it’s all up to you.

The system is extremely easy to maintain. In fact, you can clean the membrane within minutes, and you only need to do so a few times a year.

The RO membrane is also long-lasting and requires change after about 2 years of use.


  • Removes 98% of chlorine and other contaminants
  • Produces up to 300 gallons of water per day
  • Wastes about 25% less water than other RO systems
  • Is easy to install
  • Comes with a mountable metal bracket


  • Water has a plastic smell if the system is installed in a warm location.

2. HydroLogic Stealth RO 300 With Upgraded KDF Filter

HydroLogic Stealth RO 300 with Upgraded KDF Filter

The HydroLogic Stealth RO 300 with an upgraded KDF Carbon filter (pre-installed) removes more than 98% of all the harmful contaminants in your tap water.

The unit filters water in 3 stages and comes with a cleanable sediment filter that removes sand, silt, dirt, and other large particles.

The carbon filter eliminates chlorine while the RO membrane gets rid of TDS and microorganisms present in the water.

And just like the 31040, this system can produce up to 300 gallons of pure water per day. It also boasts a 2:1 waste to pure water ratio, meaning that for every gallon of pure water produced, 2 gallons of water go to waste.

Thankfully, it offers an optional 1:1 ratio flow restrictor that helps save 50% more waste water.

Although great for drinking and cooking water, you can customize the HydroLogic Stealth RO 300 for gardening and hydroponics.

The package comes with a wall-mountable metal bracket, a garden hose connector, an inline shut-off, 5 ft. inlet line, a membrane power flush kit, a filter wrench, and instructions.

The unit is compact enough as it measures 6.2 x 16 x 18.5 inches and weighs 12.5 pounds.


  • Removes most contaminants from tap water
  • Can be customized for gardening and hydroponics
  • Produces up to 300 gallons of pure water per day
  • Comes with everything needed for installation
  • Easy to maintain


  • Might be a bit bulky at over 10 pounds

3. HydroLogic Stealth HL 36012 RO System

HydroLogic Stealth HL 36012 RO System

Last on the list is the HydroLogic HL 36012, an RO system with a capacity of 200 gallons. It’s a compact unit measuring 19 x 16.5 x 6 inches and weighs 8.6 pounds.

Using 3 individual filtration stages, the HL 36012 can process and filter up to 200 gallons of water per day. This may vary slightly depending on water pressure.

Increasing the water temperature increases the cold membrane water output to 400 GPD. You should, however, note that increasing the input pressure reduces filter lifespan.

The system has a waste water ratio of 2:1 with an optional 1:1 ratio flow restrictor that saves 50% waste water.

The unit filters water in 3 stages to turn your contaminated tap water into pure water. The pre-filter removes sediments, rust, dust, sand, and other particles from the water.

The water then passes to the coconut carbon filter that removes chemicals like chlorine from the water. In the 3rd stage, the RO membrane removes all microorganisms and TDS from the water.

To keep the system working appropriately, it’s recommended that you replace the pre-filters every 3 to 6 months and the RO membrane once per year.


  • Capable of producing 200 gallons of water per day
  • Wastes 25% less water than other RO systems
  • Economical and ecofriendly
  • Easy to install
  • Optional high flow and low pressure
  • Cleanable sediment filter


  • Plastic made


Getting an RO system from HydroLogic has numerous benefits since apart from filtering water for drinking and cooking, most of the units are also customizable for gardening and hydroponics.

Although you might invest more in their high-quality systems, it’ll pay off in the long run.

Over to you! We’ve covered what we consider to be the best HydroLogic Stealth RO 300 systems. Now the decision is all yours. Choose the one you consider the best fit for your home and start to enjoy pure water.

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