MSR Miox Purifier 2011

The MSR Miox Purifier is a very compact and lightweight system that applies an electric current to a small portion of rock salt solution, that’s in turn added to the water requiring purification. To operate the system, fit two lithium batteries into the red purifier unit, fill the salt chamber with rock salt (supplied) and add a few drops of water. Shake the device, remove the salt chamber and then press a button on the device. Pour the salt solution into your container of dirty water. Use the test paper (supplied) to check the condition of the water. Leave the water to stand for 15 minutes to kill viruses and bacteria, 30 minutes to kill Giardia and 4 hours to kill cryptosporidium. No pumping is required and you can treat the water away from its collection point. But that’s a lot of work compared to simply pumping some water through a filter. Also, there’s no actual filtration taking place, so you may also need to filter the water to remove grit. You’ve got batteries to replace, rock salt and test papers to buy on a regular basis if you’re a frequent user. Compared to others, the running costs per litre are very high.

Filter type purifying salt solution
Replacement salt, batteries and test strips £20
Effectiveness bacteria, parasites, viruses
Flow rate up to 4 litres in 15 minutes to 4 hours
Service life 200 litres
Packed size 19x5cm
Running costs 1 litre = 67.5p up to 200 litres; 1 litre = 10p over 200 litres
Weight 176g
Made in USA
Number of stores in the UK 10
Stockist details – tel. (01629) 580484;


The MSR Miox Purifier is a unique solution to purifying water, and in its favour is its light weight. Against it are the running costs and the complex processes involved.

Review by Graham Thompson
First published in Trail magazine June 2011