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Hi Trish As Robert suggest, the WataTest works well to check chlorine solutions in Ebola context. It has been designed to test a 0,6% solution, so it works for 0,5%. To test 0,05% you just test a 10 time bigger sample. I've tried it myself, it works. Advantages : Antenna technology is already present in Guinea, Liberia and Sierra Leone, and the WataTest is relatively cheap and produced locally.