Yes, 75 gallon tank.
There really isn't any 'excess' to account for. The outflow line from the pump stays 100% full, in addition to the inflow line to the pump. When the pump is on, it's basically dripping out of the check valve right into the 'flow line system' with all the connections. Well, there is that tiny bit of tubing that connects the checkvalve to the 'flow line' but it's so tiny (and hidden with electrical tape in the photo) that I don't worry about it.
The flush line is, yes, just that, there is a short space there where the two fluids may meet, I use the 'topoff' pump to flush that. I used to have the pumps (and all connections) on the other side of the stand, thus there was a lot more need to flush the line (since it was 4' long), now it's much less important and part of the reason for the pump move too.
I think once I get a larger volume container setup for the topoff that I'll run that pump for the entire period the fert pumps are running. It's interesting to watch the fert pumps run, because it just basically squirts out little droplets in the line, spaced with a vacuum "bubble."
Those piece of crap grasslin timers reset themselves again sometime today, just the two fert pumps, yesterday it was just the macro pump. I'll need to do something about the timer situation immediately, it can't wait for the AC jr. Well, maybe I'll order it within the week instead of "eventually" as planned. I wish I knew why the timers were resetting randomly.
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