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Cleaning Out Mineral Deposits
Removing mineral deposits is similar to the method for cleaning out bacteria, with slight variations.
Instead of a bleach mix, vinegar will be used. It seems that vinegar works better at breaking up deposits when it’s heated. It doesn’t have to be boiling hot; around 120 degrees Fahrenheit will do.
Again you will pour the liquid into the overflow tube, allowing the vinegar to sit for about 30 minutes before flushing.
Next you will want to clean out the jets, this time using Allen wrenches. Start off with a small wrench and as you clean out the jets increase the size of the wrench. Be cautious when using the wrenches, as porcelain chips easily. Again use a hand mirror to check your work.
If the problem persists, it is a good indication that you may need to install a water softener.