Brine tank overflows or fills with too much water after regeneration

Safety first: Unplug the unit and place it in bypass. Use a wet/dry vacuum or bucket to remove excess brine from the tank before working.

Step-by-step checks:

• 1. Inspect air check: Remove the brine well cover and inspect the air check valve at the bottom. Ensure the float or ball moves freely and is not jammed with salt mush.
• 2. Check brine flow control: Locate the brine refill flow control button or orifice in the valve or brine line. Remove and clean it; replace if missing or damaged.
• 3. Examine brine valve: Disassemble the Marlo brine valve assembly. Inspect the seat and seals for wear or debris that could prevent full closure.
• 4. Test refill volume: After reassembly, manually initiate a regeneration and measure the water level rise in the brine tank during refill. Compare to Marlo specifications.

When to replace parts: Replace the Marlo brine valve assembly or brine flow control if they do not regulate refill properly. Replace the air check valve if it fails to stop brine draw at the correct level.