I believe I have the concept of the overflow/sump/return pump system down. There is just one more thing I want make sure I am right about. That is that the gph
rating doesn't give the actually gph
of the overflow but the maximum it can handle. Therefore an overflow can run a any gph
from zero to the gph
it is rated. For example a 600 gph
overflow will run at 450 gph
if the return pump is a mag 7 at 4' (mag 7 has a flow of about 450 gph
at 4'). This is correct, right?