I agree with Raindog on the flood and drain.
Lovely system when set up right with the right medium.
I build my own wilma type system these days and in some place use wilmas. Which is essentially a Recirculating system.
There's all sorts of drain to waste and Recirculating systems available now .
You can go silly with things like a green man system (if they still make them) but I don't see that combining lots of systems has any advantages.