Yes, mold, mildew, bacteria, and slimy pink biofilm can grow inside a water softener brine tank, especially if the unit sits idle for extended periods, operates in a humid basement, or uses unrefined solar salt containing organic impurities. The warm, damp environment combined with salt creates conditions where certain microorganisms can thrive along the inner walls and water line. While the internal resin bed filters these out during normal cycles, a neglected brine tank can develop foul odors. Verification: Inspect the interior of your brine tank annually and clean out any slimy residue or debris.
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