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IME if you give it max vacuum from the outset - by pulling the wire through sharply - it'll maintain that flow rate.
Some physicists will be along shortly to correct me.
I last did this 40 years ago.
And it was dark.
^ Sounds like I've been duly corrected. Ta @Colin_the_Bald.
JurekB
Yeah I've been eyeing them up. Thing is they all come with a tiny hose and I want to attach it to a c.20m garden hose. Trying to work out if I can find one the same bore.
@JurekB surely the vacuum is just to get the system started? once that's remove it has no influence on flow rate .