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How's this for an idea:
so you have a running sump that keeps the level of water, perhaps, about 1/3 the height of the sump. When the return pump is off, the water level is 2/3 the height of the sump.
How about if you plumb a drain bulkhead just above the 2/3 height of the sump. If you always turn the return pump off before you do a water change, then the water you add to the display drains to the sump and "dirty" surface water drains to the floor drain. You just have to remember to turn the pump back on when the water change is done. Kind of semi-automatic. I am thinking of doing this, so I would like to know what you think of it.
Thanks,
kathy
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