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A check valve will surely prevent water from flowing backwards, as that's exactly what it's designed to do. In case you're not familiar with them, the arrow points in the direction of flow. So whichever way you want the water to flow, point the arrow in that direction.


You should siphon the water out using a tube or flexible pipe. I have included an article containing instructions on how to do this here. You will have to adapt it to a much smaller scale, but the principle is the same. If you just do a search for siphoning, maybe you will find a better/more applicable example. I just chose this article bc it wasn't about ...

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