Hello Emily,
Since there is no performance curve for the Beckett injector, it is tough to gauge or engineer a skimmer with predictable performance. Partially that is why I don't use them anymore in my designs.
There actually could be a variety of reasons. It could be the injector itself not able to really push that much more air or water through it. Or it could be the pumps not able to push enough water with the increase in pressure it sees on the outlet.
Take a look at some of the injector curves in the library and I think you know what I mean.
Titus
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