Dishwasher Detergent Dispenser

I'm using a dishwashing detergent in form of a grain/powder for my dishwasher. I don't like the "Tabs", as they are both expensive and not working as good as the grain.

However there is a big downside. Filling the small detergent box in the dishwasher's door from the detergent bag is challenging and will often end in filling too much grain into the dishwasher and the detergent is elsewhere in the machine.

Therefore I decided to design a dispenser, that will fit onto a standard PET-bottle, at least onto the european PET bottle screws which are called PCO28. I guess the name is based on the fact that the diameter is 28mm.

How it works:
You fill the detergent powder (not working for liquid) into a PET bottle and screw the dispenser on top.
To put some detergent into the dishwasher, hold the bottle upside down and point it into the detergent box in the dishwasher's door and pull the trigger arm gentle until the powder trickles out of the dispenser. Release the Trigger Arm and th