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So you’ve found this user-friendly countertop alternative to under-sink and whole house RO systems and want to know if it’s worth all the hype. 

In this buyer’s guide, we’ve carefully put together a detailed list of the features, specs, pros, and cons of the KFLOW Reverse Osmosis Countertop System and its replacement filters.

To make your work easier, we’ve described the components of the system, their functions, and other considerations like:

  • long term cost
  • water capacity
  • length of time it takes to filter water
  • ease of set up and use
  • filter efficiency

So, should you invest in it or not? Read on to find out.


Best KFLOW Reverse Osmosis Countertop System

KFLOW Reverse Osmosis Countertop System

kflow reverse osmosis machine

Key Features:

  • Size: 10x10x14 inches
  • Jug Capacity: 1.7 liters
  • Cartridge Life Span: 2970 liters (or 1 year)
  • Number of Filter Cartridges: 4
  • Contaminants it Removes: 1000+
  • Display: Digital LCD
  • Price Range: $$$$

KFLOW 1st-Stage Water Filter Replacement Cartridge

kflow filter no 1Key Features:

  • Size: 2.7 x 2.7 x 12 inches
  • Material: Polypropylene
  • Cartridge Life Span: About a year
  • Filtration accuracy: 5 microns
  • Filters out rust, red worms, and tiny particles like sand and dirt
  • Water Pressure: 0.1-0.4 Mpa 
  • Water Temperature: 4°C-40°C
  • Price Range: $$$$

 

KFLOW 2nd-Stage Water Filter Replacement Cartridge

kflow filter 2Key Features:

  • Size: 2.7 x 2.7 x 12 inches
  • Material: Polypropylene
  • Cartridge Life Span: About a year
  • Filtration accuracy: 5 microns
  • Filters out chlorine, organic matter, and other micro-particles
  • Water Pressure: 0.1-0.4 Mpa 
  • Water Temperature: 4°C-40°C
  • Price Range: $$$$

 

KFLOW 3rd-Stage Water Filter Replacement Cartridge

kflow filter 3Key Features:

  • Size: 2.7 x 2.7 x 12 inches
  • Material: Polyamide
  • Cartridge Life Span: About 2 years
  • Filtration accuracy: 0.0001 microns
  • Filters out antibiotics, heavy metals, pesticides, viruses, and bacteria
  • Water Pressure: 0.1-0.4 Mpa 
  • Water Temperature: 4°C-40°C
  • Price Range: $$$$

 

KFLOW 4th-Stage Water Filter Replacement Cartridge

kflow filter 4Key Features:

  • Size: 2.7 x 2.7 x 12 inches
  • Material: Activated carbon
  • Cartridge Life Span: About 1 year
  • Filtration precision: 0.1 microns
  • Filters out remaining particles
  • Water Pressure: 0.1-0.4 Mpa 
  • Water Temperature: 4°C-40°C
  • Price Range: $$$$


Our Research


Our Picks for the Best KFLOW Reverse Osmosis Countertop System

KFLOW Reverse Osmosis Countertop System 

Features and Facts: Size: 10x10x14 inches; Jug Capacity: 1.7 liters; Material: Food-grade plastic (machine); glass (jug/ carafe); Price Range: $$$$

 This countertop reverse osmosis system from KFLOW is currently one of the bestselling filters on the market.

It comes packed with innovative and user-friendly features like a smart indicator on its LCD display that lets you know how many total dissolved solids are in your clean, filtered water, and when it’s time to replace your filters.

The sleek stylish machine also boasts a 4-stage filtration system that removes more than 1000 contaminants such as fluoride, mercury, and other heavy metals from your water.

Another high-tech feature is its multi-filtration technology, which re-uses the remaining water from the last filtration for the next round instead of dumping it.

Pros:

  • Very easy to assemble
  • No installation needed
  • User-friendly display
  • Built-in TDS indicator
  • Filter life indicator
  • Environmentally friendly (recycles water)
  • Water is purified within minutes
  • Filter replacement process is quick and easy

Cons:

  • Replacement filters are pretty costly
  • Filter cartridges can be hard to source
  • Users complain that filters only last about 6 months (half the lifespan advertised)

The KFLOW RO countertop filter is an excellent choice for people who don’t want or need to spend extra money on an under-sink or whole house filtration system. 

If your main concern is having pure water to drink, cook with, water your plants and feed your pets, then this machine might be ideal for you. 

 

KFLOW 1st-Stage Water Filter Replacement Cartridge 

Features and Facts: Material: Polypropylene; Cartridge Life Span: About a year; Filtration accuracy: 5 microns; Filters out rust, red worms, and tiny particles like sand and dirt

This replacement filter was designed for KFLOW’s reverse osmosis countertop system. It is the filter the machine uses in its first step of filtration. 

The plastic cartridge contains layers of membranes that only allow particles of up to 5 micrometers/ microns in size to pass through. Particles like cement dust and some bacteria are about 5 microns small. 

Don’t worry though, this is only the first stage of filtration. The 1st-stage cartridge protects the more delicate membranes of the other filters. 

The other three cartridges use filter membranes that have much smaller holes that allow virtually only water molecules to pass through.

Pros:

  • Very easy to remove and install
  • Filters quite well

Cons:

  • Does not last as long as a year in most cases
  • Quite expensive for a filter

Some things to remember when using the filter in the KFLOW countertop RO system is that you should only use municipal water between 4 and 40 °C and make sure the water pressure isn’t too high. This will help extend the filter’s lifespan. 

 

KFLOW 2nd-Stage Water Filter Replacement Cartridge 

Features and Facts: Material: Activated carbon; Cartridge Life Span: About a year; Filtration accuracy: 0.5 microns; Filters out chlorine, organic matter, and other micro-particles 

The second filter in the 4-stage system filters out particles up to 0.5 microns small without letting carbon particles enter the filtered product. 

To give you an idea of how small 0.5 microns is, some bacteria and the particles in coal and tobacco smoke are 0.5 microns small.

Replacing the filter is a pretty straightforward process that shouldn’t take more than 3 minutes to complete.

All you have to do is take the cover off the side of the machine and twist and take out the old cartridge. Next, place the new one into the empty space, and twist to lock the cartridge in place.

After doing this, press the reset button on the machine to sync the new filter with the system, and that’s it!

Pros: 

  • Filter is easy to change
  • Effectively filters out microparticles

Cons:

  • A bit expensive for a water filter

We suggest that you use the manufacturer’s recommended filter for each stage, as doing this helps to protect the more delicate membranes from damage. 

 

KFLOW 3rd-Stage Water Filter Replacement Cartridge 

Features and Facts: Cartridge Life Span: About 2 years; Filtration accuracy: 0.0001 microns; Filters out antibiotics, heavy metals, pesticides, viruses, and bacteria

This filter is used in the third stage of the KFLOW reverse osmosis water filter countertop system. It features a reverse osmosis membrane which, according to KFLOW, can filter out more than 1000 contaminants from your water

The membrane can effectively remove the tiniest particles such as heavy metals, smog, and viruses. For reference, the smallest viruses, bacteria, and dust particles are larger than 0.001 microns.

Pros:

  • Filters out the smallest contaminants

Cons:

  • Pretty expensive for a filter

KFLOW’s 3rd stage water filter removes even the tiniest particles to give you pure, clean drinking water. 

 

KFLOW 4th-Stage Water Filter Replacement Cartridge

Features and Facts: Cartridge Life Span: About 1 year; Filtration precision: 0.1 microns; Filters out remaining particles; Input Water Quality: Municipal water

In the last step in the filtration process, the pure water is passed through a coconut carbon filter to improve its taste and balance the pH.

The membrane has 0.1-micron holes that block any escaped ultra-fine particles from entering the pure, filtered product.

Pros:

  • Improves taste of water

Cons:

  • Pricey for a water filter
  • Some users complain that it doesn’t work

This filter cartridge’s main function is to produce clean tasting and smelling water. 


How Often Should You Flush Your RO Membrane?

KFLOW recommends that you flush your reverse osmosis filter system about 10 to 15 times if necessary after you set up the system for the first time or replace the filters. For under-sink and other types of RO systems, we recommend that you periodically flush the membrane. 


What Are the Different Types of Reverse Osmosis Systems?

Undersink

This type of RO system is perhaps the most common among homeowners. Under-sink filter systems are affordable options and eliminate the hassle of refilling (which you would have to do with pitcher filters and countertop RO systems). 

This makes these water filters a great option for people who only need filtered water for purposes like drinking, cooking, and feeding their pets. If you plan on buying one of these, here’s a handy tutorial on how to install a reverse osmosis system.

Countertop

Countertop reverse osmosis systems have a sleek, compact design similar to that of a coffee machine. They are very easy to use, pretty quiet, and fit on your kitchen counter. 

So if you’re someone who doesn’t need an expensive whole-house or under-sink filter system, this would be an excellent option for you.

Portable

Portable RO systems are designed to be carried around and set up in locations like campus dorms, RVs, campsites, and disaster-hit areas. All that’s required for these filter systems to work properly is enough power, water and pressure.

Many portable systems on the market today come with a built-in pressure gauge and thermometer. Some even have a solar panel attached to the case for conveniently charging the built-in battery. 


KFLOW Reverse Osmosis Countertop System Key Points

To buy or not to buy? That’s up to you! 

Now that you’ve read our review of the KFLOW Reverse Osmosis Countertop System, we’d like to think that you’re well informed and ready to make your decision. If not, let’s recap the key features of this machine:

  • Removes more than 1000 contaminants
  • Has a digital LCD smart display
  • Has a 1.7-liter capacity
  • Easy to assemble
  • Filters are easy to replace and last about 6 months, according to users
  • Replacement filters are expensive
  • Produces clean water within minutes

Reverse osmosis water filter systems generally give you purer water than other types of filters, like activated carbon for example. 

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