How to regulate flow rates cheaply?
I am wanting to test out my system by varying flow, and I was wondering if there was an easy way to throttle the flow rate of pumps? I know a few have knobs, but my Eheim 1250 does not. Ideally this would be something I could pick up at a hardware store (a valve or something?). I just haven't ever tried this before so I was interested to see if anyone else had a nice setup.
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