First way: paremeter
One way to make a Pure Pipe becoming impure is add a parameter to your Pipe.
when you want to refresh, just change the parameter.
Second way: without parameter
Pure Pipe will be fired when its input has a new instance. So with TypeScript 2.1+, the below code will copy the original object with a new instance, and lead pure pipe to be fired.
let copy = { ...original }
Negative impact
This will force your component to refresh your pipe every time a variable changes his value, even if this isn’t the one used within the pipe contains
Stackblitz
Both ways are included in stackbliz demo.