Follow along with the video below to see how to install our site as a web app on your home screen.
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What you're controlling is the amount of water that is allowed to escape out the bottom of the skimmer (rather than being pushed up as bubbles). So when you set it to "min", you are pushing more water up into the column - which causes it to overflow. When you max it out, you are pushing less water up into the column, which then stays below the cup's edge.