Ok, we've set up a kiddie pool for our three ducks. We manage to dump the whole thing [which is NOT easy!], hose it out and put in fresh water about once a week .... SO FAR. Anyway, is there anything that can be added to the 'pond' to help keep it clean naturally and won't harm my duckies? Like, uh.....baking soda? Apple cider vinegar? Orange cleaner? Hydrogen peroxide? Right now when it gets to the green stage, it's a mosquito heaven!!! YIPES. UGH. UGH. The only OTHER option I can think of 'might' be a pump/filter thingie that runs continually, but if it's too costly or troublesome, I would probably resort to plan A again! Ideas? Experiences? Links? Thanks! Opps, I think I posted this twice! Can't figure out how to delete it!