Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Worked great the first two nights but then quit

I have grown up using a vaporizer for colds and when my 7 month old caught her first cold I thought I would use it to help her sleep at night. First of all if you have soft water you must put salt in it every night dispite the claim in the instructions that you shouldn't have to do so more then once or twice to get it to work. First night I had to use two servings of the recommended salt content and it worked great after that. All night long! Second night I used only one serving due to the instructions warning that if you use too much salt it can burn out the motor and then you are screwed. It started to work and worked for a couple hours, but when I checked on my baby around 2am it had quit. Third night I again used one serving of salt and it did nothing the whole nite. For the money I didn't waste much but now I have to find another one so my child can sleep at night. The first night it worked the best but I took it back and got a refund.