2 system A/C preventative maintenance check complete. Left replacement filters. Added chlorine tablets to the condensate pump. Tested mechanical and electrical components, all in good shape. Recommend hard start kits to reduce the load on compressors. Recommend surge protection to protect units from power surges. Recommend APCO air purifier to prevent mold, and kill bacteria, germs, and viruses for improved air quality. Installed hard start kits and surge protection for both condensers. Installed APCO mag in the main system. Systems are cooling at this time.