The biggest culprits of water loss are running commodes and malfunctioning water softeners. To test the seal of the commode(s) we suggest putting a few drops of red (only because it shows up better) food coloring in the back of the tank. If after an extended amount of time the food coloring appears in the bowl than that means the seals are not sealing properly and should be replaced. With a water softener it is harder to identify and might be appropriate for a professional to be called.
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