E18 error and the unit reports a brine tank over-salt or compaction condition.

Safety first: Unplug the unit before working inside the brine tank. Wear gloves and eye protection when breaking up hardened salt.

Step-by-step:

• 1. Inspect salt level: Open the brine tank and visually inspect. If the salt appears as a solid mass, it is likely compacted.
• 2. Break up compaction: Use a plastic tool or broom handle to carefully break the salt into smaller chunks. Remove large hardened pieces and discard if necessary.
• 3. Check brine grid: If your AquaHouse tank has a grid or platform, ensure it is not clogged with sludge. Lift it (if removable) and clean underneath.
• 4. Add water if needed: If the tank is very dry after clearing, add 2–3 gallons of water to re-establish a brine pool.
• 5. Sensor check: If equipped with a brine tank sensor, clean and inspect it for damage. Reconnect wiring securely.
• 6. Run regeneration: Restore power and run a manual regeneration to confirm proper brine draw and refill.