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The best shampoo bars for hard water and how to use them

How to use shampoo bars in hard water | The best solid shampoo for hard water areas | Sage Folk Plastic Free Online Shop

Not all types of shampoo bars work well in hard water due to a combination of the ingredients they use and their PH level. If you live in a hard water area, the best shampoo bars to use are going to be those that contain cleansing ingredients like surfactants.

Sage Folk is based in Norfolk, an area that has very hard water. I tried for over a year to transition to using “natural shampoo” (shampoo that doesn’t contain surfactants) and personally found that I was using an increased amount of water to wash the natural shampoo out of my hair, and still felt like I had build up after washing.

Since then, I’ve tried and tested lots of shampoo bars and these are some of the best ones I’ve used:

2-in-1 shampoo and conditioning bars by Zero Waste Path | Available at Sage Folk

Wild Ona Shampoo Bars - Available in Pure, Green Queen and Balance | Sage Folk

Monoi de Tahiti Shampoo Bar for dry and frizzy hair types - Bain & Savon | Sage Folk

How to use shampoo bars in hard water

If you’ve chosen a shampoo bar with a surfactant ingredient, then it’s going to work very much like liquid shampoo in terms of washing results and you shouldn’t be left with the feeling of product build up or a waxy or chalky residue in your hair.

To use a shampoo bar:

  • thoroughly wet your hair
  • moisten the shampoo bar and lather it up between your hands
  • transfer the lather to your hair and work in
  • rinse out and condition

If you have particularly long or thick hair, or if you simply find it easier to do so, you can also rub the lathered up shampoo bar directly onto your hair, and the lengths of it, to distribute the suds throughout it that way.

Which solid shampoos to avoid using in hard water

Natural shampoo bars are usually the culprits when it comes to undesirable wash results in hard water areas. This is because they are most typically soap based and don’t contain any ingredients like surfactants to boost their cleansing properties.

If you’ve had first hand experience of that waxy residue left in your hair after using a shampoo bar, then you’ve most likely been using a natural shampoo.

Having said that, some people will get on perfectly fine with natural shampoo bars and enjoy using them. For those that do, I stock a range of natural shampoo bars handmade by lovely, independent UK makers.

Why doesn’t natural shampoo work well in hard water?

Hard water has a high mineral content which can react with the ingredients in natural shampoo and leave a residue in your hair, no matter how much you rinse it.

The other property of natural shampoo that effects how well it works in hard water is that it often has an alkaline PH level. It is this PH level which is often why you might see people using acid rinses, such as a vinegar rinse, alongside using a natural shampoo bar.

Whilst there may be similarities in the ingredients that natural shampoo bars and other types of shampoo bars have, natural shampoo bars will commonly have oils and fats as their main ingredients. Look out for the following:

  • Sodium Olivate (olive oil)
  • Sodium Castorate (castor oil)
  • Sodium Cocoate (coconut oil)
  • Sodium Sunflowerate (sunflower oil)
  • Sodium Shea Butterate (shea butter)

What’s the difference between natural shampoo and regular solid shampoo bars?

The main difference between the two types of bar is the ingredients they use and their PH level.

What is mostly commonly known as natural shampoo are shampoo bars that work in a similar way to soap bars, using saponified fats to clean your hair without the use of any type of detergent or cleansing agent.

Solid shampoos that use surfactants will contain one or more ingredients to boost the cleansing properties of the bar. This makes them very effective at cleaning your hair, no matter what water type you use them in, and will do a much more consistent job of removing any dirt, product or mineral deposits that you have in your hair.

Depending on the bar you choose, surfactant based solid shampoos will likely be PH balanced so that there is no transition phase and no need to use a vinegar rinse alongside them too.

If you want to choose a shampoo bar with a surfactant in it, look out for these ingredients:

  • sodium coco sulphate
  • sodium cocoyl isethionate
  • sodium cocoyl glutamate
  • decyl glucoside

Which is better: natural shampoo or shampoo with surfactants?

Natural shampoo is not recommended for coloured hair, as it can cause fading. Other than that it largely comes down to personal preference and the results you want for your hair.

As I’ve mentioned, my personal experience with using natural shampoo in a hard water area is that it can take more time (and therefore water) to achieve the results I wanted for my hair. Because of this, I prefer to use shampoo bars that contain surfactants as they are more user friendly and I prefer the wash results.

Why some people don’t like SLS and surfactants

Perhaps one of the main sticking points with surfactants, particularly those like SLS (sodium lauryl sulfate), is that they can be petroleum derived and synthetic (although there are many plant-based surfactants too).

SLS in particular can be irritating for some (not necessarily all) people’s skin and scalps and some people simply don’t like the results they get from washing with it.

A lot of the shampoo bars that we sell contain a plant-based surfactants that are commonly considered gentler than sodium lauryl sulfate.

We’ve found The Eco Well’s article on SLS to be a useful resource if you would like to dig deeper into the science behind surfactants.