[untamed]

Originally Posted by michika

I want to plumb my tank up so that I can just turn a valve, and shut off the return pump to do water changes. Simple, no bucket lifting, no fear of mess, and no funny dirty water smell. The same would go for adding in the fresh saltwater. I guess that means the tank will be plumbed into the drain, and I'll also have independent drain access incase I need it for something.

The system I have in place allows this to happen without turning off the return pump. The key is to plan for a 2nd sump..basically a large container that you can draw system water into prior to dumping it. The trick is to ensure you are replacing the same amount that you dump. Basically, the 2nd sump is a giant measuring cup.