Yeah I couldn't find any gate valves at my local hardware store. I was told I was asking for a flood by reducing flow on my drain. But if I open the ball valve a fraction more I get bubbles and noise like crazy.Hmmmm. Why did they say it wasn't good? I have ball valves on every single pipe I have... never been an issue. But, gate valves are supposed to be even better...
I have found the perfect balance between the pump and drain but if anything got lodged in the drain by the ball valve I would have a flood on my hands... I have a few weeks to figure it out while my tank cycles.