Rod: I built a surge according to your instructions from the Midwest Frag Fest, and would like to suggest to anyone making a flapper style surge to use fishing line instead of a chain. It may be because mine is small (~4 gallons in a wastebasket), but I had trouble with the chain kinking and preventing the flapper from closing. I even went to American Science and Surplus for the plastic chain you recommended.
Roman Ogee: I would like to know how you plumb your siphon-based surges to reduce bubbles entering the tank. Every siphon-based surge I've seen has been an almost continuous surge of bubbles.
Roman Ogee: I would like to know how you plumb your siphon-based surges to reduce bubbles entering the tank. Every siphon-based surge I've seen has been an almost continuous surge of bubbles.