We switched to using t for everything because other deteregents can cause buildup in your washer which can in turn cause build up on your diapers. We like it a lot. Our clothes are so much cleaner and fresh.
I bought the gallon jug and it lasted me for 3 or 4 months.. that is washing diapers daily, plus using for our clothes too. Then.. when I reordered, I was their ____(I can't remember which #) customer and got my order doubled (free gallon!).