500ml in 40 minutes at 52" head pressure, which is what my tank will typically see. I might be able to use this for topoff with a longer duration, if the pump doesn't burn out first. I'll be running some more experiments. They don't reccomend using this pump over 30"head pressure, but I think it's mainly because it doesn't pump much at that head pressure. I don't think the pump will burn out.
FILSTAR Pimp #2
75 gal heavily planted,50/50 Black beauty,Eco-complete substrate, Pressurised CO2 with solenoid, ph controller, AB Reactor 1000, 330 watts 9325K GE PC lighting,Ehiem Liquidoser, 2-Filstar xp3 canisters.