Thats funny, I was just about to post a question about the very same thing..Here's what I was told----mix 1 tablespoon Kalkwasser with 1/4 cup R/O water. mix well and let settle. Turn off all pumps in tank, NO water movement. Use a syringe (no needle)to very slowly put a tiny amount of solution into center, (make sure it is fully opened)they said they should die within a few minutes but to be careful not to put to much extra in your tank, and to leave the pumps off for another 25 minutes. My question is WHY?? What do they do?