just surface-level mineral residue.
Another indicator is the absence of any signs of moisture or leaks. If the area surrounding the valves is dry and free from water stains or discoloration, this suggests that the buildup is not associated with a leak. You can also perform a simple test by applying a few drops of vinegar to the powder. If it fizzes and dissolves, it’s a good indication that the substance is calcium carbonate.
3. Signs the White Powder Means a Slow, Hidden Leak
If you notice wetness, discoloration, or a persistent damp smell around the shutoff valves, these could be signs of a slow leak. Leaks can cause mineral deposits to form as water continually evaporates, leaving behind the mineral content.
Additionally, if the buildup appears to be localized to joints or fittings and you observe corrosion or rust on metal surfaces, this may indicate that water has been
