Use this link: http://www.aquaticquotient.com/forum...user-Generator
But, it never gets around to saying how long a batch works. If it is a week, that's very usable. If it is a day, it isn't usable at all. I'm tempted to buy a kit and at least test it. The price isn't bad, but it comes from Hong Kong. I think I would use a check valve with it to stop tank water from flowing back into the bottles.