Completed 1 system inspection. Checked all safety and components recommend clearing drain line to insure no clogs , Verified filter 110 is needing to be changed. Tech does not have filter and would need to be order from apex. Spoke with customer about changing filter as well as getting on a maintenance plan. Customer is ordering filter for tenants to change. At this time system is operating. Customer went a head with drain line clearing. Tech cleared drain line with 2 gallons of drain cleaner.