I would recommend no less than 15lpm each bucket, ideally 20lpm per bucket with good quality air diffusers.
Brands of pumps are literally in the dozens.
I have the GH 4 outlet dual diaghram thing. Works amazing. Don't cheap out on air and stones. and keep an eye on your stones they stuff up sometimes. I lost probably half of my last yield due to late flowering issues. fml. im done rambling.
So much stronger than the pump that came with my dwc bucket setup. Wasn't really sure if it was better to have 1 airstone or 2 though so I just fed all 4 outputs to 1 stone.
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