What to do with too much water?

New player here. In short, my previous game died because lack of water. So when I discovered 4 water vents on my current playthrough I had to catch them all. Problem now is I don't need more farming or electrolyzers, what else can I dump excess water into since my base is kind off a little flooded as of rn.

Edit: it's under controll for now. We are venting pure oxygen out the airlock. 🤦‍♀️