I was being far too cautious with slime biomes. The ore purifyer doesn't even seem to be necessary. Or that useful actually, because you're not getting all the slimelung off the slime in one washing and when you put it in storage the slimelung regrows. The watertrap does seem necessary unless you want to create po2 with slime and then purify it. No heat o2 generation, but slow generation. A washstation or sink next to your slime storage IS necessary, and seems to be sufficient to keep them from getting sick.
It's like they were saying, you just go slow in slime biomes and plop down a lot of air purifiers. Remember to dig out the slime if it's in direct contact to any structure you build, because it's annoying to have little guys going to sterilize it once a day.
I haven't hit a point where I need to use slime to create water. I prefer to drain pools. But slime will create an awful lot of water. A single ice biome represents so much freaking water. I also don't use a lot of water. The Super computer takes a fair amount but that amount if static, it's not an ongoing consideration. Oxidizers don't take all that much. Reed plants do take a lot, but they're so fast growing that it seems excessive to plant more than 3-5 of them. Berry plants take some, but not very much. I wind up with lots of liquid storage containers usually and plans about making a hydrogen room eventually that I haven't made yet.
Water is almost a waste product the way I play. There's probably some critical use for it that I haven't thought about yet.
I don't -love- oxidizers because of the heat gen. Oxidier(s) + pump + filter in an enclosed space very quickly results in a very hot space. And if you try to use that o2 directly to vent your base, you'll have a very hot base before long. So you have to run that through cooling and it starts to become more trouble than it's apparently worth when the algae pumps are so effective. True, you would eventually run out of algae... but that would take quite a while.