I did receive advise from my LFS to do a 5-10 second FW dip to knock the flatworms off my mushrooms. True to make the PH and temp near the same. You know, it worked!! The mushrooms looked like ca-ca for a little bit, but back they came. I just did it on my mushrooms and palys...but now I am more comfortable with an iodine dip instead....you use SW and follow the directions on the Lugols bottle.