I am setting up a tank with an overflow that has a 4 cm drain pipe. I really wanted 5 cm, but the dude who built my tank made the hole a little too small, and I can only fit a bulkhead for a 4 cm inner diameter pipe. So that's what I have to work with.
Seeing that I wanted lots of flow, I went for a Jecod DCT-15000 pump, thinking that I could always regulate it down, if need be. Well, I underestimated this pump, which is a monster! Even on the lowest setting, it sucks my sump dry, because the water just can't return fast enough through the overflow.
My wife wants some type of water feature for the garden, so the DCT-15000 will come in handy for that project, but now the question is, what pump should I buy for my tank? I'll probably order online for cost savings. Any suggestions appreciated!