Now...that's watta'm talk'n 'bout. All the calculations were making me a little crazy.
Sounds like a plan. However, i do not have a floor drain. The water change drain (WCD) will flow into a wall drain (sink drain on other side of wall), I can plumb into that drain pretty easily. It will be lower than the WCD hole. I can make it as low as I need to for the old saltwater to be gravity feed into the wall drain. I was thinking about plumbing in at 2" below the WCD hole. The water will be traveling a distance of about 36" from the WCD hole to the wall drain. How does that sound.
Hoping to order the sump today!!!!!