Found this stuff: http://www.killlakeweeds.com/index.cfm?fuseaction=dsp_products&product_ID=61

I'm gonna give it a try.

1 gallon should do a pond my size(0.18 acre). With Cide Kick II, and a sprayer, it still is way less than a pint of Sonar.

Anyone ever thy this product?

I already ordered it, so to late to change my mind.