My Opinion and reasoning:
- Use a PRESSURE RATED PUMP for the reasons mentioned by Jack above. You don't want the pump you are using to lose a significant amount of flow over what it is rated for, especially when you need all the force you can get (1000 gph min at the Beckett) to draw in air.
- I have run every pump listed above on Beckett skimmers, nothing touches the quality or performance of the IWAKI. MAK is a great all around pump that doesn't cost too much but gets the job done. Both of these pumps are external fan cooled and can be fairly loud! Mag's and Velocity do introduce more heat than the other options.
If you buy a non pressure rated pump, you essentially have to purchase a pump with an extremely high flow rate... such as a MAG 18 or 24... because you now know that it is going to lose a significant amount of flow while running the Beckett due to the fact that its not pressure rated.
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