I have a smart silver jr. I got it from custom electronics, and it cost 129.00. I have been really happy with it http://www.colloidaltech.com It also has an optional stirrer to make even smaller particles. It makes 32 ounces at a time and takes about 4 and a 1/2 hours to make 10 PPM solution. It tells you when the water is pure enough to make CS and the light blinks at each PPM, and automatically shuts off at 12 PPM, after settling it is about 10PPM. The rods are 99.99% pure and are large rounded wires. Super easy. The best thing is you can e-mail the company and they will mail back about any issues you have or ?'s Well worth the $$$$$$$