Posting this because several of us were thinking about using them in our CP soil. *The problem with them is that when they break down, they may fertlize the soil. *According to the Gardener's Supply catalog I got today, Terra-Sorb is potassium-based and breaks down into fertilizer. *Other types of these water absorbing crystals are sodium-based and break down into salt compounds. *While some CPs are tolerant of fertilizer, like some Nepenthes, others like Venus Flytraps aren't. So be aware of this if/when you use them.