A 250g tub of Cleaner/Steriliser by Young's.
Use for fast sterilising prior to brewing. The easiest way to sterilise! Takes approximately 10 minutes to sterilise containers and equipment for home brew use.
Can also be used for removing staining or limescale from kettles and stained cups.
The amount you use varies depending on what you're using it for - full dosage instructions on the side of the tub.