For people of a meditative disposition the lava lamp is a vital piece of furniture. Useful as a focal point, to soothe, enhance and generally make your environment more relaxed and maybe a bit groovy.

However, after time or if some fool picks it up and shakes it, a lava lamp can become cloudy which pretty much renders it useless. You turn it on and all the action is hidden behind a mist (see right).

Now, as part of the Molten Meditation project I'm creating a meditation event where a group of people get together and meditate to the music. To create the right environment I want to use as many lava lamps as I can lay my hands on.
As if ordained by the hand of God I stumbled upon a job lot of eleven on ebay in various states of repair and for a real bargain price. Of the eleven, eight were complete and working and of those, four were cloudy. For the price I paid just one working lamp would have still been a bargain!
And so began my research into how to de-cloud a cloudy lava lamp. Mathmos, the makers of the lamp, insisted that nothing could be done but were happy to supply a new filled bottle for £23. Not too bad if you've only got one but it would soon add up with the number I was trying to fix. Came across a couple of good websites and forums talking about lava lamp problems and found the solution I am going to describe here on
There was lot's of talk about long term cycles where you turn it on for six hours and then leave it off for two hours - continuously for months and also some people had success after freezing them. But then there was a post from a guy calling himself Neural Network Instructor who laid out a method using Epsom Salts (magnesium sulphate) and plain cold water. Another guy Eddie George backed this up and expanded on the description a bit to make it easier to understand. This is the information I took to try on my four lamps and I can tell you - it works!! I've put this page together just to show in as much detail as I can how the method works so that everyone can benefit from Neurals and Eddies contribution to the world of lava lamp restoration. Thank you, and now onto the good stuff.
I'll go through step-by-step what I did and I hope you have as much success as I did. However, if you do completely destroy your lava lamp trying to do this then if you don't mind I won't take any responsibility for that at all - do this at your own risk. Lots of pictures to follow...
The gear you will need:
1x cloudy lava lamp
1x flat bottom glass
1x tub of Epsom Salts (200g is plenty)
1x bowl of hot water
1x drinking straw or pipette
Here's my cloudy Astro. Something definately goes on in there when it's switched on but you can't see it.
Nope, not a sausage.

Make sure that the lamp is cold before going any further.

The wax inside must be solid and cold or you will end up pouring it all away or breaking it up into tiny blobs.

If you've had the lamp on then leave it off for a couple of hours at least before proceeding.
First thing to do is remove the lid - this will undoubtedly invalidate your warranty, if you've still got one. The lids seems to be glued or sealed or something and so took a bit of might (and the right tool) to unscrew them.
Pour the water away gently. The wax must be solid when you do this.

There's a definite paraffin sort of oil smell and some detergent like bubbles in the water.

Add some COLD water, gently, down the side so not to hit the wax directly and swill it around gently and pour away.
Repeat the gentle swilling until no more bubbles or oily scum is seen.

They you'll be left with just the solid wax in the bottom and a nice clean bottle.
Fill the bottle, gently again - don't pour water directly onto the wax, to just below where the neck tapers - so when you put the cap on the water line is above the bottom of the cap.
Nice clear water! There's bound to be some stuff floating about unless your rinsing was very thorough.

Leave the lid off.

Turn the lamp on!

The lamp now needs to heat up until the wax is fully melted.

Add a couple of drops of washing up liquid detergent - only two or three drops though. Neural called it a "surfactant". In one of mine the wax has become really bubbly which may be because I put too much in - don't know really.

Meanwhile... Let's get the Epsom Salts made into a solution.
Epson Salts are magnesium sulphate crystals commonly used for the relief of constipation. You will find them at the chemist or pharmacy/drug store. Tell them it's for a friend of yours. You only need a small tub - 200g and it'll cost about a pound or so.

Get a flat bottomed glass and half fill it with water.
Add a quarter of the salts and stir vigorously until they dissolve. Add like a teaspoon full at a time. When they no longer dissolve get a bowl and filled it half full of hot water and stand your glass in it. This will dissolve plenty more crystals. I dissolved about three quarters in half a glass - and you will not need that much.
The lamp heats up as you would expect it to and for a while you think that you've fixed it already. Neural said that with his lamp the wax just melted flat. Eddie said that he had a bit of a dome going on. I had a mixture across the four lamps. With this Astro it was a bit lively and kept globbing up but never released a bubble.
This was the sort of action I had when the wax was fully melted. Don't be disappointed if yours is much calmer or does nothing at all - that's what the salt solution is for.
Once the wax is fully melted you need to add the salt solution gently. It can have quite a dramatic effect on the wax and even break the wax up if you just chuck it in.

Best bet is to use a straw: dip it in your salt solution about an inch, and put your finger over the top. If you have a pipette then use that you posh person you.
Transfer to the lamp and release you finger to let it drip down the side of the bottle.

What's happening (I think) is that you are increasing the density of the water which keeps the wax together and makes it lighter in comparison to the liquid (sounds feasible).
When you add some salt solution the lamp might swirl a bit and start glooping about - however, give it a minute or two and it will settle again - then add some more (gently).

What you are trying to achieve is for bubbles to rise all the way to the top before falling again. Often they just go half way or it makes a column.
After some patience, probably a hour of adding drops, waiting, adding some more, making a cup of tea, it should start behaving much more like it should.

Here's mine, cloud free, working like a treat!
Neural suggests adding some food colouring to colour the water - who has food colouring knocking about these days? It's the sort of thing your mum has decomposing at the back of a cupboard. Anyway, I haven't added any but it might be worth a try :)
The Astro was a complete success - the other three were a mixed bag but all positive in that they are better then they were. Here's a red Jet lava lamp as a comparison.
Very cloudy this one and completely useless as it was.
As I added the salt solution it started getting very weird and bubbly.
Until it was all a bit out of control.

I'm not convinced that this is totally my fault. When it was cloudy I'm sure what you could see of the wax was very much like this so it's probably down to it being shaken or dropped at some time.

Still looks pretty funky though.
And here's a picture of the other three together. The red one, as seen above, is a bit crazy and has clouded a bit from all the small bits of wax floating around. The orange AstroBaby is fabulous but has bubbles in the wax - cool effect though. The yellow Jet was much clearer and looks like a load of psychotic peas bouncing around, but now it's clouded a bit as well so I might have another go, or maybe add some food colouring to give a better contrast.
There you go, two complete successes and two not bads out of the four.

I hope that's been helpful and remember that none of this is my fault - good luck! If you have a different experience or want to share then please drop me a line to the address below.
Got some food colouring - works like an absolute treat - you only need literally two drops; I overdid it a bit but it looks fantastic anyway :)

Can you guess which one?
It's the one on the left!