Some toilet will have slow water inlet or no water inlet after long term use. This is because filters of the inlet valve are block.
Pervious solution: Take out the inlet valve filter for cleaning. However, this way is difficult to most of people.
HTD solution: B8 fill valve with Self-cleaning function .
Now,let HTD tutor show your the vedio to know more about The New Item B8 Self Cleaning Toilet Fill Valves.