Valve on Sump Drain Line

[bjbass]

I have a AGA 210 megaflow with dual overflows and a Marineland model 4 sump. I put a T with a ball valve on my return line and I figured I would add an inline ball valve on my drain line. Is this a common practice? Should I do this?

Two drawbacks I see are if I forget I have it closed and anything that pumps back in won't be draining back out which results in overflowing tank!!

Also, material could get stuck on the valve.

What does everybody do during water changes? I have an Aqueon water changer that I am going to use and siphon the tank.

 

[mgamer20o0]

well once you start sucking the water out and gets bellow the over flow line you can turn off the pump. once its bellow the over flow line it wont drain anymore.