To Dump or Not To Dump... That is the question

Hello fellow art teachers and followers,
   I have a question... When painting do you let your students "dump" their water when it gets too dirty? Or do you have them keep the same water all through class?

I hate having dirty water when I paint so I wanted my kids to be able to have clean water for as long as possible. My first year teaching we used these cups that would only hold about 1 1/2 cups of water. Students were having to go to the sink constantly. Especially when we used liquid tempera or acrylic. 
Now, I use huge buckets of water for painting. They are used dog treat buckets which hold about a quart of water (we fill them halfway). The buckets never tip over because of their size, they are still easy for kids to pick up, and they may have to be refilled once during a lesson. I used to ask kids to raise their hand for me to check if the water was too dirty and tell them to "dump" or not. That became too much. So now I tell the kids to dump their own water when it turns to mud and they can no longer see their brush when pressed against the inside of the bucket. 
This water needs changing! 
So, my fellow teachers, what do you use as water containers and when do you "dump"?

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