Yes. Deeper vac for 1st stage, less for 2nd and 3rd.
I use a water recirculating pump and it's sufficient for at least 2 filters, maybe more I'll see soon. No cold trap required with water recirc pumps.
How do water recirculating pumps compare in terms of performance with a water faucet aspirator.. how much money can be saved making a diy recirculator for this purpose with a faucet aspirator, an aquarium pump and a tote?