Im running inin-sump pump. I have tried the L1 and it wasn't much more real-life flow than the Jaebo. I'm pretty sure the modded off the shell tank I use for my sump is tempered glass, so I can't drill for an external pump.
I used the Danner Pondmaster 6000 for a while,m and it provided the flow I wanted, however the stainless impeller warped and destroyed the pump.
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