Ok I have a question on DE I bought some mixed it with the straw. And for a while the flies seem to disappear. But then I went out today to change the water and there were tons of flies again. So my question is what can I do to keep the dang flies undercontrol. Just to let you know I have those fly sticky hanging things in there with alot of flies on it. Then I read today that if you put orange zest around it the flies dont like citrus I did that and more came so I dont know. Its just getting annoying. Any help would be appreciated. Thanks!