How To Avoid Water Spots | Spot Free Water

— What is Spot Free Water 

Have you ever washed your car and noticed some nasty looking marks covering your vehicle. This quite often happens on particularly hot days where the water evaporates off the car before you get the chance to dry it. What’s left behind is minerals in the form of a  ring where the water droplet once was, this is whats called a water spot. You may not see it initially but over time water spots will accumulate and make your vehicle look dull.

Water Spots

The best practice is to avoid getting water spots in the first place, not just because they look unsightly, but they can become troublesome to remove and in some situations permanent (unless polished away). Sometimes you can get away with spraying some detail spray onto the water spots and wiping away with a microfiber cloth, however if your water is as hard as where I live you may have to resort to aggressively scrubbing the spot untill it is removed. This is not a good idea especially for your paintwork, not such a big deal with glass as it is much tougher and less likely to scratch.

One of the ways we’ve managed to combat this is through using spot free water. This is where the water used when cleaning your vehicle has been treated in order to remove most if not all of the minerals.

— How I Get Spot Free Water 

Spot Free Water

The blue highlighted links below will take you to the Amazon website where the items can be purchased. As an Amazon Associate I earn from qualifying purchases.

The way I achieve a spot free wash is with a DI Resin Filter (different size vessels and connectors available so choose the appropriate one), this allows me to produce De-Ionised water which is achieved by essentially filtering out the unwanted contaminants such as calcium, magnesium and other ions found in tap water.

In order to do this I use two different types of resin (Cation & Anion Resins). The need for two resins is because there is a wide range of contaminants that will not all be removed with just the one type.


I currently use a Mixed Bag of Resin (Cation & Anion Resins Pre-Mixed) just to keep things simple and this way I only require one Di-Resin Vessel which saves space in my van.

— How long Will The Resin Last 

Over time the resin will become full of contaminants and will no longer be effective to use. How long your resin will last depends on how frequently it is used and most importantly how hard your water is. Hard water will fill the vessel with contaminants much faster than soft water. You can use a PPM Meter to get an accurate reading of how hard or soft your water is.


The reading I have taken shows the water at 250ppm (surprising as its usually above 350ppm).

Below you can see a scale of what your reading will represent, a reading of 000ppm is “Pure Water”, and so should not leave any water marks when left to dry. Above 100ppm is classified as “Medium Water” and above 200ppm “Hard Water”.

Water Hardness (Rescaled)

Once I’ve ran a decent amount of water through my resin, I tend to use the PPM meter after each use to get an accurate representation of whether the water is pure or not. I will not necessarily change the resin immediately as in most situations I am going to be wiping the vehicle down with products and so “Soft Water” is still appropriate. The reason for this is that if water spots did form they should be easily removed due to the water being soft.

An example of this is rain water (which is generally classifies as “Soft Water”), rain water does produce water spots, however as it is “Soft Water” the ring of minerals usually wipes right off without much effort.

If the weather is getting hot or the resin is no longer classified as “Soft Water” I will then change the resin.

— Benefits 

I love using De-Ionised water, as not only does it leave me with a better finish, but I no longer have to rush around when drying the car, and in some situations will allow the car to dry naturally saving me a lot of time without ruining the finish.

side shot finished

Thanks for reading!

The links above may take you to the Amazon website where the items can be purchased. As an Amazon Associate I earn from qualifying purchases.

Check Out More Blog Posts

Enter your email address to subscribe to this blog and receive notifications of new posts by email.

Find Me On:

Facebook Icon

Instagram Icon

Twitter Icon

     Youtube icon 2  Check Out My Youtube Channel!

If You Have Any Questions Please Leave A Comment

If You Enjoyed, Please Share 🙂

About the Author

Contact Now

How To Avoid Water SpotsBlog Image Water Spots 2