NPH 7B Proper way of Flushing the Toilet

[video width="640" height="352" mp4="https://faqs.taneres.com/wp-content/uploads/2020/06/WhatsApp-Video-2020-06-25-at-10.12.17-AM.mp4"][/video] Tenant must hold the flushing button for 15 sec until all flushing water out. And would be better do the second time flushing when the water tank refilled water. Even if they are pressing the big flush button...but only press for 2 to 3 sec, then will still get clogged someday.