You want STPP not TSP - Sodium tripolyphosphate. From the Chemical Store, online. TSP is NOT as effective and can be damaging. Interestingly I was called by Fox News a few months ago about this because I had posted on their site about it. However, they never ran the story. They had been asking in a poll about it and I posted the answer to use STPP and they told me many others are doing the same. The real kicker is that hotels and restaurants are REQUIRED to use phosphates and they are far bigger users of the detergents than all households combined. Damn this government to HELL! And DAMN the EPA!!!
In Virginia, commercial dishwashing and some laundry for hospitals & the like are exempt from the ban, as are some food processing and dairy outfits, as long as the Phosphate content is below about 8.7 % I think it is. There are some exemptions for stuff used to clean counter tops and other food-related cleaning.