Home and Garden

Home and Garden, Natural Cleaning

Is Borax Safe For Cleaning With?

what is borax substitute

Today let’s talk borax,  Specifically, is borax safe for cleaning with.  You see, in my green cleaning kit, I always have a box of borax to hand.  It’s a handy ingredient to have.  Especially when there are so many uses for borax around the house.

Yet every time I mention borax here on the blog a well-meaning person or two often comments, telling me that I shouldn’t be using it in my home or encouraging Moral Fibres readers to use it in their homes.  Often claims are made that borax is dangerous, and effects on fertility are cited.

I genuinely appreciate this concern, I really do.  And not wanting to risk mine or my family’s health, or the health of Moral Fibres readers, I have done quite a bit of research into if borax is safe to use around the house.  I thought I’d share the results of my research here in the hope it can be helpful.

First off, it’s critical to mention that in the UK and EU you can no longer buy borax.  In 2010 the EU reclassified the ‘Borate’ group of chemicals that Borax belongs to as potentially hazardous to health.  Therefore it is no longer available as a cleaning and laundry product.  Instead, you can only buy “Borax Substitute”.  We’ll get on to the what is borax substitute question in a moment!

Borax: The Science Part

Let’s look at the chemical differences between Borax and Borax Substitute:

What is Borax?

The chemical name of Borax is Sodium Tetraborate.  The borate at the end there signifies it’s a boron compound.  All borates can be considered derivatives of boric acid.  Borax occurs naturally, being produced by the repeated evaporation of seasonal lakes.

What is Borax Substitute?

The chemical name of Borax Substitute is Sodium Sesquicarbonate.  Sodium Sesquicarbonate is a mixed crystal of Sodium Carbonate (washing soda) and Sodium Bicarbonate (bicarbonate of soda).  It has a similar pH to borax.  It is also gentler than Sodium Carbonate yet stronger than Bicarbonate of Soda.  The water bound up in the crystal means that the product is cold water soluble.  Unlike Sodium Carbonate, which cakes with cold water.

is borax safe

Is Borax Substitute Safe?

Let’s look at the evidence:

Borax’s Historical Uses

Sodium Sesquicarbonate is included on the INCI list of cosmetic ingredients.  It’s well known for its water softening properties.  And cosmetically it has traditionally been used in bath salts and bath bombs, hair care products, and deodorants.

Outside of the cosmetics sphere, it’s also heavily used.  From swimming pools to in water treatment plants, and as a phosphate-free replacement for cleaning.  Apparently, in Japan, people are going crazy for Sodium Sesquicarbonate for it’s cleaning properties.  Perhaps they read Moral Fibres?!

Surprisingly, it’s also used in food.  Sodium Sesquicarbonate, is, in small amounts, FDA approved as a food additive in the US.  Here it’s used as an acidity regulator, anti-caking agent, and as a raising agent.  Interestingly, it’s not food approved in the EU or Australia.

What about the safety of borax subsitute?

It’s long history aside, what about its safety?

This report is probably the most comprehensive I’ve found on the safety of borax substitute.  It’s four pages long, so in case you don’t have the time or inclination to read it, I’ll summarise it for you.

Borax substitute is not considered to be harmful to health or the environment.  They have found it may cause slight irritation to sensitive skin.  It may irritate the eyes if the dust gets in. And, lastly, it could be harmful if ingested in large quantities.  Apart from that, there are no main concerns.

To double and triple check, I kept up with my research.  I wanted to dot the i’s and cross the t’s if you will.  What I found was that the Environmental Working Group has, despite gaps in their data, classified Sodium Sesquicarbonate as low risk.  This means no serious issues have been identified.

Similarly, the PAN Pesticides Database has so far found no risk.  Meanwhile, this scientific journal found that in high doses (in rats) it caused conjunctivitis and it caused skin irritation. However, they have concluded it is safe to use in cosmetics.

My Conclusion?

My conclusion?  I’m perfectly happy to use Borax Substitute in my house for all my green cleaning needs.  I do, of course, adhere to the general principles of storing cleaning products away from children and pets.

Is Borax Safe?

We’ve now established that Borax Substitute is safe.  However, this is all well and good for my fellow UK and EU readers.  But what about readers from other countries?  As I’m recommending Borax Substitute, but unaware if Borax Substitute is available in your country, I feel like I’ve got a duty of care to find out if Borax (the Sodium Tetraborate stuff) is safe too.

So, is borax safe?  Turns out the is borax safe question is a bit harder to answer.  It’s a bit of a grey area, so if you are not in the UK or EU then I’m afraid you’ll have to make up your own mind.

Let me present the facts:

Studies cite that they have tested either sodium tetraborate or boric acid.  However, if you remember from the science part at the top of this article, sodium tetraborate is not boric acid, it’s a derivative of boric acid.  There’s quite a bit of a difference, chemically.  However, the studies are vague.

Boron is an element essential for human health.  It’s pivotal for healthy bones, joints, and dental enamel.  It’s also important in regulating the absorption and metabolism of several elements – including magnesium, calcium, and phosphorous.

You can even buy boron food supplements.  Excess boron tends to be excreted out of the body, suggesting that boron, and its derivatives, do not bio-accumulate in the body.

Borax is commonly used in natural laundry powders.  So far I haven’t been able to find any deaths directly attributable to borax.

However, it’s a different picture when you look at conventional alternatives to natural laundry powder, such as detergent capsules.  I have found reports of 1,500 cases of poisoning from detergent capsules in three years.  The same article reports that one child a day had to be hospitalised in 2012 and 2013.  What’s more, one child has died from detergent capsule poisoning.

Known Studies on the Safety of Borax

The EU has banned borax on claims of impacts on reproductive health, following studies on mice and rats at high (abnormally high) ingested doses.  The only study I can find looking at the potential impact of human reproductive health is this one.  This study crucially relates to boric acid, not borax, and investigates the reproductive effects of boron exposure in workers employed in a boric acid production plant.

The study found that the factory workers, representing worst-case exposure conditions to boric acid/borates are considerably lower than exposures which have previously led to reproductive effects in experimental animals.  No ill-effects on the worker’s reproductive health could be found.  The study concluded that “dose levels of boron associated with developmental and reproductive toxic effects in animals are by far not reachable for humans under conditions of normal handling and use“.  Therefore even if you are handling borax all day every day, like these workers are, you are unlikely to encounter any problems.

Other Key Borax Points

Borax is not a known carcinogen, but like borax substitute, it can be a skin irritant to sensitive skins.  I think it’s also important to bear in mind that many things we have in our homes are harmful in high enough concentration.  Salt, for example, is harmful, even lethal in high doses, yet we quite happily sprinkle it on to our cooking.  I wouldn’t recommend eating borax at any dosage.  There are reports of borax inhalation irritating airways.  I wouldn’t recommend inhaling borax.  Some people seem concerned about the effects of clothes washed in borax.  However, borax is poorly absorbed through undamaged skin.  Your rinse cycle on your washing machine should also take care of rinsing away any excess borax.

So, What’s The Answer? Is Borax Safe?

I don’t want to tell you if it’s safe for you to use borax or not.  I don’t feel it’s my place.  Instead, I want to present the facts so that you can make up your mind.  Personally?  Is borax safe?  Based on what I’ve found out, if stored out of the reach of kids and pets I would be quite happy to use it in my house.  I personally feel that conventional laundry powders and liquids and bleach-based cleaning products pose more of a risk to human health and to waterways, but that is just me.  I’d encourage you to do your own research to work out was if using borax is best for you or not.

What are your thoughts?  Is borax safe?  Are you happy using borax substitute?  Do you feel happy using it in place of Borax?  If so, what do you use borax for?

ps: I have written a book on green cleaning – packed full of recipes for natural cleaning for all around the home.  You can check it out here!

Home and Garden, Natural Cleaning

Homemade Scouring Powder Recipe

plastic free dishwasher detergent tablets uk
citrus scouring powder

Want to make a natural and homemade scouring powder? Check out my best recipe below.

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My love of green cleaning is widely known.  But it might surprise you to hear I am not a lover of cleaning or housework.  I like having a clean and tidy house, but the actual cleaning and tidying part?  There’s no love lost.  My household cleaning philosophy is it gets cleaned when it’s dirty, and if we have people coming over I will clean and tidy a bit more than normal. Otherwise, I have no cleaning schedule or anything like that apart from hoovering regularly, and tidying things away when it needs it.

My hope is that when my daughters are older they will remember me sitting on the floor building Lego houses with them more than the sparkling clean kitchen sink we always had, or the perfectly clutter-free living room.  That’s what I tell myself anyway…

That being said, the kitchen sink does need cleaning sometimes.  We installed a white ceramic kitchen sink when we refurbished our kitchen and it really does show the dirt.  When it does need a good thorough clean I’ve been turning to this homemade scouring powder that I’ve been making for a little while now.

I’ve adapted the recipe from Crunchy Betty to give it a bit more scouring power, and boy is it a good one!

How to Make Homemade Scouring Powder

homemade scouring powder recipe

This homemade scouring powder consists of only three simple ingredients but packs a strong punch.  The secret is the citrus peel.  Gently dried and ground finely, it’s packed full of its fruit oils, that combined with the abrasiveness of the bicarbonate of soda and salt make light work on dirt and grime.   Beautiful smelling, it’ll leave your sink with a delightful citrus zing.  It’s also a fantastic way of using up citrus peel that might otherwise be binned if you don’t have access to composting facilities.  

It does take a little bit of patience to make but the best things do come to those who wait!


The peel of one grapefruit or large orange; or two large lemons/limes or clementines.  Whatever you have to hand basically!
2 tablespoons of bicarbonate of soda* (I buy mine in bulk)
3 tablespoons of coarse salt


Take your citrus fruit peel and tear into small pieces – no larger than the size of a ten pence piece.  Sit the peel on a plate and leave somewhere dry and warm.  My preferred location for the plate at present is on top of the fireguard, beside our wood burning stove.  It’s been drying the peel out really quickly and has the added bonus of sweetly scenting our living room.  Alternatively, place your plate on top of a radiator or on a nice sunny window ledge if you’re somewhere sunny right now (you lucky thing!).

Leave the peel to dry out – turning the peel at least once per day – until the peel is hard and dry.  Depending on where you’re drying your peel, it might take a day to four days.

Place the dry peel in a food processor/blender and blitz until you have a soft, fine powder.

Combine the powdered peel with the bicarbonate of soda and salt and place in a clean dry lidded jar.

How to Use Your Homemade Scouring Powder

As with any cleaning product, natural or otherwise, always test on an inconspicuous area first.  Once you’re happy you’re good to go:

Sprinkle your scouring powder liberally on to the surface you want to clean.

With a damp cloth simply scrub the area, adding more scrub as you feel is required.

Once finished rinse down the area that you’ve cleaned.

This homemade scouring powder is ideal on ceramic sinks and toilets, but might be too abrasive for acrylic baths/shower trays or some metal sinks.  If you want something a bit gentler you can either omit the salt, use more finely ground salt, or swap the salt for borax substitute*, like in the Crunchy Betty recipe.  If you do use the borax substitute, do make sure you rinse thoroughly once you’re done scrubbing as borax is notoriously difficult to remove once dried!  


Keep your scrub in a clean dry lidded jar.  If you are using salt or borax in your mixture it should keep for around a month, if not it will probably keep for around 2 weeks.  Use your nose and your discretion.

natural sink cleaner