Air stones or aeration diffusers have varying lifespans depending on their usage and maintenance. Regular cleaning and descaling each season (or more frequently in nutrient-rich or dirty environments) can significantly extend their functionality. Signs of wear, such as reduced bubble output, uneven distribution, or physical damage, indicate the need for cleaning or replacement to maintain efficient aeration. For cleaning, soak the diffuser in white vinegar, scrub gently with a soft brush, and rinse thoroughly before reinstalling. For extremely dirty diffusers, consider using Aquascape Pump Cleaner Maintenance Solution.