Thanks to all for responding. I understood what's said here on fixer dilution and fixing capacity. That was a lot of info. The most important thing I need to know is the recipe for mixing ammonium thiosulfate. I could not get ammonium thiosulfate in where I live. Shipping the a. thiosulfate solution isn't practical either. So, if someone knows how to mix a. thiosulfate from dry chemical, please help out. Thanks again!