As a mirror to the Walstad thread here is a thread about sharing your experience with PPS-Pro, linked below.
PPS-Pro
Personally I already had the fertilizer salts when I learned about this method but you can also perform something similar by dilluting Easy Green down to a daily dose. This method has worked great for me keeping my plants healthy and growing. Most of the salts I was able to get bulk off of ebay and for micros I use GLA's micromix.