I’ve now gone though 2X AI axis 20’s to the point I refuse to warranty the axis 20 this pump was replacing. It’s a simple continus return pump with no app control which if honest running an all AI tank was “nice in terms of all in an app” but their reliability has me concerned. Before I put the pump in I took it all apart (read directions it’s easy) soaked in hot water and a touch of dish soap. Rinsed really really well re assembled it and put right to use. It’s a simple AC ajustable return pump for constant speed but this thing is probably as quiet as the axis.