Return Pumps

[zigi99]

Other than redundancy - is there any another consideration for using two return (upload) pump vs one ?

 

[gms1234]

I'm going to be running 2 on my tank. one is my main return going straight up, other pump is going via chiller and uv at dedicated flow rate. second will also serve as redundancy.

 

[Piotrek]

I'm using 2 return pumps to enhance circulation. Each outlet is divided into 2 separate ones, so a total of 4 outlets create a decent cross flow pattern.
I recommend using the same model for both, based on my bad experience.
I'm using a Jebao 10000 and Jebao 20000. If for some reason the Jebao 10000 is turned off, it cannot be started while the Jebao 20000 is operating. The bigger pump generates so much reverse flow on the smaller one, that it's unable to start.