I'm like Lee and mostly use liquid as well. If below the water simply put the wand under the water and spray close to algae. To make it simple I use a 2-4% solution. Pretty much anything you touch with a good mist will get it. I do not have the label in front of me, and this is not what it describes, so I should not even being telling you to do it that way, but it makes it simple. You should be able to treat your entire pond several times with a gallon. It will turn brown and then fall to the bottom. I woudl not apply more than one quart at a time in your pond just to be safe.

Greg Grimes
www.lakework.com