The material inside the Zen-O lite columnsalso called sieves, sieve beds or sieve modules that purifies the air slowly deteriorates. The service life of the columns will depend on the operating conditions. Replace them as needed, indicated by the check vents alarm.
If intake and exhaust vents are not blocked and the check vents alarm persists, it's time to replace the columns.
Instructions
The columns include instructions on how to change them. Alternatively, the procedure to change sieves is available as PDF document.
