Softener mineral tank appears to be leaking from the side wall (not from fittings or top)

Safety first: Immediately place the softener in bypass and shut off the main water if leak is severe. Depressurize the system.

Step-by-step checks:

• 1. Confirm leak location: Dry the tank and observe where water reappears. Ensure it is not wicking from the top or fittings.
• 2. Inspect for visible cracks: Look for hairline cracks or bulges in the tank wall.
• 3. Check for freeze history: Consider whether the unit was exposed to freezing temperatures, which can cause tank rupture.

When to replace parts: Do not attempt to repair a cracked pressure tank. Replace the entire Marlo mineral tank and transfer the valve and media as appropriate. This is typically a job for a professional.