Harris Beer Brite Finings Single Sachet for 1 x 5 gallon

Amazon

For 22.5 Litres / 5 Gallons Highly Active Beer Finings Simple to use - Quick to clear Simple to use - Quick to clear Can be stored almost indefinitely.

The Home Brew Shop

Harris Beer Brite Finings Single Sachet for 5 gallons of beer a very powerful form of dry isinglass finings