3. House vac is fine for filtrations. For rotovapping, you would likely need a pump for anything with a moderately high boiling point. The diaphragm pumps are the norm these days for such things, but leave a lot to be desired in terms of performance and robustness. They're also quite expensive to fix when they do (and they will) break. For schlenk line work, belt driven pumps are dandy.
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