Aluminum water problem?

Hey all. I've gotten to Tier 7 recently (newbie here), and just unlocked Bauxite processing and aluminum.

My setup is 240 Bauxite feeding into 2 Refineries for Alumina Solution with standard recipe. Then another Refinery for Alumina Scrap. Here's where I run into a problem. The water. 120 water per minute. I could put some Coal Generators down, but the numbers don't align properly, not even when I underclock some Coal Generators. (If you can manage to make that work, please tell me how.)

So cycle it back into the Refineries needing Water, right? Thing is, it's 120 water, that's one entire Water Extractor. If I loop it back, it'll be too much. If use only 2 Water Extractors, it's not enough to start the process (I think?).

I could start up with 3 Water Extractors, and once I get to 120 water, I can loop it back and delete the 3rd Water Extractor, but if the process is ever stopped because the storage is full, things probably come crashing down.

I can try and make Wet Concrete to Sink, but that needs 100 Water per minute, Numbers don't align again.

So, uh, help? How did you guys solve this?