Michael –
Have a look at this thread: Prips flux and you will find the formula posted by Peter Rowe back in 2000.
Looking at the MSDS on Cascade powder it seems to have phosphates but also plenty of other stuff??? I’d be leary of using it.
Real TSP is basically non-existent for the consumer. What’s available is phosphate free. I’ve made Prips with the fake stuff and it mostly works but I’ve not compared it to Prips made with the “real” stuff.
Why not just buy some Smart Flux from Pepe Tools?
I’ve used it. It works great.
– alonzo