GPH for undercurrent DWC

Danner Supreme Mag Drive 9.5 (950GPH) will work no problem for you. I am using one for my 6 site RDWC (link in signature). I have also used this pump for saltwater aquarium continuous for 8+ years only needed a new impeller and gasket ans till going now 13 years.

@TheGreenHornet you are going to put 2" pvc in standard round buckets?

TheGreenHornet said:

Ok, Thanks feasy. this is my 1st undercurrent, I'm upgrading from reg DWC systems, super excited

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The minimum for UC is 12 circulations/hr, so you'll have way more than enough flow.