Display shows a reminder such as “CF” or “CHANGE FILTER”; spa otherwise operates normally.

Safety: You may leave power on while removing the filter, but ensure pumps are off.

• Clean filter: Remove the Caldera filter cartridge. Rinse thoroughly with a garden hose. For heavy buildup, soak in a spa filter cleaner solution, then rinse well.
• Replace if worn: If the pleats are frayed, collapsed, or permanently discolored, replace with a Caldera-compatible filter cartridge.
• Reset reminder: Follow your model’s instructions (often holding a specific button combination) to reset the filter timer.