Unfortunately, the toilet went complete garbage.  Right After the installation the flush function of this product was slow. It cannot flush even the clear water and I do get a problem after the first "normal" use. I did try the use the toilet anger, hoping that something like the not-noticed piece of foam was stack in the siphon - but it just broke the toilet anger wire (bend badly) - so you can only cut the broken part. Probably something from the toilet ceramic making process was   left inside the siphon part of the waterway, so it is not possible to clear the pass. The only solution - is change the toilet completely. So, my piece became a garbage.!  I did a video of clear water flashing which is take more than 1.5 minutes just to pass the water through! But this review did not accept the video.
Update: It was installer problem. After re-installation product meet the expectation.