imho all pumps are useless and you get way more fluids by just getting a better matter manipulator. Just beat the heart of ruin to get the best one
But yes, the Densinium Pump is a bit faster compared to it's predecessors.

Well my MM is nearly maxed out on all nodes, just need a few more on power and size.
Though getting the modules is what's stopping me.
But I use the pump mainly for processing water into hydrogen for ship fuel, I know there is better but on an ocean planet it's easy unlimited fuel.

I didn't mean maxing the MM (which is very helpful of course) but replacing it with a better variant. (Which will need more modules again...)
I always just tore apart Moons, threw the rocks in the Crusher and the Sand in the Sifter. Both yields sizable amounts of Erchius, liquid and solid.

But for a passive setup I can see where you are going. Though I'd recommend adjusting the amount of pumps to your final processing speed for optimal output. I honestly do not think a single densinium pump will suffice...