What kind of current does your pump draw? If it is less than 3A then you should be able to run it on a really inexpensive Variac (check ebay). For more powerful pumps the VariAcs get expensive. I am thinking about doing exactly the same thing to a 500GPH little GIant I have for testing purposes. This works more nicely than a ball valve because you aren't fumping a ton of heat into the water when you throttle it back. I am not sure a simple dimmer switch is going to be a good long term solution for your pump though...
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