Each vortex scales at 42 inches width. I could go with (4) 48 inches vortexes but I would probably loose my line-up of filters. Hey maybe I can go with (2) 48's and (2)42's...good idea...hope that would suffice 10,000+ gallons?
Because I have a 48" elevated deck, sides of the pond are 24 inches from the deck and the pond is situated on a slight inclined maybe I'll dig 36" max. unless I should go for 8' depth...