I need help with string algae in my pond. I've never had it come on like this before. I had to drain most of the water this spring and clean out dirt and fish waste. It had been collecting for several years in a small area. My pump and filter were getting over worked and clogged up at times. But, since I've done this, I have string algae by the gobs in the pond. I bought a product called Algaway 5.4. It will not hurt fish or plants. I put some into the waterfall and it cleared all of that up in days. But, it isn't helping me out in the pond. I don't know how much to use. How can I calculate the gallons in my pond water? I have scrubbed off excess. I never had this problem when I first started my pond up. I don't like using chemicals because other animals come for drinks at the pond and, even though it says not harmful to fish, I don't know about the rest of the critters coming in. I appreciate any help someone has to offer. Jax