How to Purify Water for Window Cleaning

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Window cleaning is an important activity for your overall home/office hygiene. It’s an involving activity and when well done gives you much satisfaction.

The water you use for this activity needs to be free from impurities to achieve the best results. Your regular tap water may not give you the desired results.

Contaminated water will leave your windows with a milky white residue that’s not appealing. It may also leave behind stains and spots on your windows, making the whole window cleaning affair unsuccessful.

The beauty of cleaning the windows with pure water is that as it strives to go back to its natural state of having impurities, it clears all the dirt.

As you rinse the windows, since the pure water doesn’t have dirt particles, it evaporates naturally, leaving behind spotless surfaces.

What do you do before knowing how to purify water for window cleaning?

First, use a TDS meter to establish the level of total dissolved solids in your water.

TDS Meter

For clean spot-free windows, ensure the TDS levels for your water are between 0-10PPM. Actually, many professional window cleaners insist that the TDS level should be 0PPM for the best results.

There are two main processes you can use to purify water for window cleaning:

  • Reverse osmosis
  • DI resin

Let’s get started and know how to purify water for window cleaning.

Using Reverse Osmosis to Purify Water for Window Cleaning

Reverse osmosis is a purification process that uses several purification processes and a RO membrane to achieve pure water.

This process involves the following stages:

1. Sediment Filters

This initial stage involves passing the water through a sediment filter, which should be 5 microns.

This phase’s essence is to eliminate the physical components, such as sand, silt, metals, and dirt. Ensure that the filter is made of pure polypropylene fibers for the best performance.

2. Carbon Filters

Under this stage, the water is passed through an activated carbon filter. This is to remove the chlorine content in your tap water. Also, you extract organic components in the water at this stage, such as pesticides and volatile chemicals.

Removing the organic components and chlorine at this point is critical as it protects the membrane from damage.

3. Reverse Osmosis

Under this stage, the water is pushed through a semi-permeable RO membrane. The membrane allows the water molecules to pass through and prevents the contaminants from proceeding further into the system.

The membrane contains tiny pores of 0.0001 microns that allow only the water molecules through.

Your water needs to be under high pressure for the membrane to function optimally. The unwanted ions and salt components are drained at this point.

4. Post Filtration

This process includes an additional activated carbon filter that polishes your water. This stage is meant to eliminate any other impurities that could have escaped all the previous stages.

It exists to give you quality content for your window cleaning exercise that will give you spot-free windows.

When utilizing this system, go for one with the non-proprietary filters as they are easily available in the market. This way, you can easily plan your replacement schedule without hitches.

5. De-ionisation

With a deionization filter, the positive hydrogen molecules and negative hydroxyl molecules present in the water are exchanged.

Your TDS meter reading should be at 0000 Parts per million particles of water at this final stage.

This means your water is now fine for the window cleaning exercise. The now purified water will give you clean, spotless windows upon completion of the exercise.

Check the filters and the membrane occasionally to ensure that they are functional at all times.

In the multistage system that has reverse osmosis and DI combined, the membrane works to remove TDS, thereby extending the life of your DI resin.

When you connect the system to a water-fed pole, ensure you test it frequently for TDS to be sure that it dispenses pure water all the time.

Water Fed Pole System

Using DI-Resin to Purify Water for Window Cleaning

Still wondering how to purify water for window cleaning? The DI-resin is an amazing method.

It is the most common way that professional window cleaners purify their water. It can be a final stage in the reverse osmosis procedure or a unique stand-alone procedure.

The resin, an insoluble component in water, is made up of plastic beads with organic polymer beads charged.

The essence of the process is to yield a TDS reading of below 10 parts per million of water.

The DI resin works to lower the TDS level through ion exchange. It controls the electrical charge of ions present in the water and makes it possible to remove the total dissolved solids present in the water.

It purifies the water by attracting the non-water ions and replaces them with hydrogen ions making it possible to remove the total dissolved solids. This leaves you with pure water suitable for cleaning your windows.

The durability of the DI resin highly depends on the TDS level of your water. A high TDS level will wear out the system faster as compared to a lower one.

If you use the DI-tank in a multistage system, you will have to replace it several times in the year.

DI Tank and Resin

Use a TDS meter to establish the dissolved solids content in the water to enable you to make the right decision on the purification process to use.

Factors to Consider When Choosing a purification system for Your Window Cleaning Exercise

1. TDS Levels

This is the number of contaminants in the water you intend to use. To know these levels, you will need to have a TDS meter.

The desired TDS levels for window cleaning water should not go beyond 10 PPM. Most professional window cleaners will insist on 0 PPM for their water.

TDS level gives you a clear picture of your water quality and makes it easier for you to choose your water’s most convenient purification system.

The general rule is that a stand-alone DI-resin system will do for a TDS level of 100 and below. This will be cost-efficient and will yield the 0PPM pure water level required.

Above 100 TDS content in areas that require regular window cleaning, a multi-stage process will be more cost-effective in the long run. This is because you don’t burn the resin very fast, which is expensive.

2. Cleaning Frequency

The number of times you will be cleaning will affect the system you use to purify your water.

Let’s say your water has a TDS level of above 100, but you will be cleaning once a week, then a stand-alone DI resin will work perfectly.

However, if you are involved in the daily cleaning and your water is above 100 TDS reading, you will have to use a multi-stage purification process.

3. Height of the Windows

How high you will be cleaning the windows will affect the purification system you choose. This is because, for highly-placed ones, you will need a water-fed pole attached to your system.

A reverse osmosis system works under pressure and will be best for high windows as pumping the water up under pressure becomes easier.

4. Number of People Cleaning at a Time

In a case where you have several people cleaning simultaneously, you may consider a reverse osmosis system. This is because you may need several water-fed poles at a go. A stand-alone DI resin could easily wear out due to being overworked.

A stand-alone DI resin system will work perfectly for a single person cleaning once or twice a week.

5. Water Texture

You may have to apply the reverse osmosis system combined with the DI-resin system for hard water areas. This is because hard water will need a stronger procedure to purify.

A filtration procedure alone can not soften the water, but with the DI, the calcium and magnesium ions responsible for water hardening will be exchanged.

Benefits of Pure Water Window Cleaning

1. Efficiency and Spotless Cleaning

When you utilize pure water for your window cleaning, you are assured of clean, spotless windows in the end. The pure water acts as a lubricant that breaks the bond between the window and the dirt, allowing it to be washed away.

The impurities hanging on the glass are easily rinsed away when using pure water. It also eliminates the need for costly cleaning chemicals as it works more efficiently. They remain clean for longer since there are no soap residues left behind.

2. Cost Saving

As mentioned earlier, pure water will enable you to save on expensive cleaning chemicals as it acts as a lubricant.

Additionally, if you wash windows commercially, it will save your human labor cost. By connecting the purifier to a water-fed pole, you become more productive. With this system, you will need only the person operating the system, and you can clean several-story buildings.

3. Safety

When using a water-fed pole for window cleaning, you need to have people moving around with ladders risking their lives. All you have to do is properly position the pure water system, and you can clean highly positioned windows.

With the introduction of this system, workers’ injuries are minimized to a great extent as they handle large volumes of cleaning work.

4. Environmental Friendly

Pure water acts as a natural content free from impurities. It eliminates the need for chemicals that would harm both the environment and the people handling them

When utilizing a water-fed pole system that uses pure water, the dripping pure water can not harm the plants at the ground level as it doesn’t contain potentially harmful chemicals.

5. Time-Saving

With pure water, you can clean more windows over a short period of time. This is made possible as you don’t have to dry them manually. Once you rinse, you leave the water to evaporate and dry, leaving them sparkling clean.

Pure Water Output by System

The different systems have varied output levels, and it’s worth knowing so you can evaluate the right unit for your window cleaning.

  • Simple stand-alone DI tank- 1/2 gallon per minute
  • 3-stage basic filtration system- 1/2 gallon per minute
  • multi-stage with tank – 1 gallon per minute
  • Multi-stage filtration with a pump- 1.5-gallons per minute

The amount of pure water you need for cleaning the windows largely depends on the number of people cleaning at the same time.

A single operator can clean with up to 1/2 a gallon per minute. Above two window cleaners cleaning at the same time will consume up to two gallons per minute.

For commercial window cleaning, where you have multiple operators cleaning simultaneously, a multi-stage filter with a tank will yield the best results.


Purifying water for window cleaning requires that you invest in a water purification system. Depending on several factors, you can choose to have the DI resin, reverse osmosis, or a combination of both.

With the invention of the water-fed pole, the cleaning exercise became less tiring and less labor-intensive. All you have to do is position the system at the right angle to reach all the window points when cleaning.

Unlike traditionally, where your lawn and base vegetation would be destroyed by the ladder and chemical components present in your tap water, a combination of the pure water system and water-fed-pole makes things better.

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