Why is one or more filter lights illuminated continuously?

It may be a clear indication that it's time to consider replacing your filter. Regular maintenance of your water filtration system is crucial for ensuring that you continue to receive clean and safe drinking water. For more detailed information on how to determine when it’s necessary to change your AquaTru Classic or AquaTru Classic Smart countertop filters, please refer to the comprehensive article linked below:

How do I know when to change my AquaTru Classic or AquaTru Classic Smart countertop filters?