Best ultrasonic cleaners ltd was recommended to me by a friend who has been a jeweller most of his life so I knew they must be good, they sell a massive range of top of the range ultrasonic cleaners and they give you advice and help when you ask and I chose the 6 litre analogue and it is so powerful and really is an amazing machine, they sent it out quickly and even threw in a free bottle of solution, I would definitely recommend them to anyone!