Our drinking water can sometimes contain minerals like calcium and lime that wreak havoc on our plumbing fixtures. Here are two common problems (and very simply solved) that are caused by mineral build up.
Your humidifier is constantly processing water and therefore is susceptible to mineral deposits. If it contains the panel style filter, it may be removed quite easily (shut the water supply off first). Fill an old baking tray that will fit the filter with CLR and soak the filter for 2-5 minutes on each side. Rinse thoroughly with cold water and reinstall into your humidifier. This should be done a couple of times a year. I suggest that you inspect your humidifier and smoke detectors when you change your clocks for daylight savings.
Your shower heads and tap fixtures can also clog up. Pour the CLR into a plastic vessel that is large enough to easily fit over the head of the unit. Hold the can or jar over the head of the shower or tap diverter so that it can soak for 2-3 minutes. Remove the can/jar/jug and run the tap or shower head for 30-45 seconds with hot water to flush the head. You should notice increased flow and improved performance immediately.
In both cases the CLR can be poured back into its origional container using a funnel for reuse.
If you are still experiencing reduced flow, you may wish to remove the aerator, as there may be sediment that has been caught inside. Simply rinse this out and reinstall.