If you don't hear the pumps then that is no bueno, but those back pumps sometimes need a bit of priming to get going even if the pumps are working. Try hitting fill when you are moving slowly. There are lots of flaws with the aerator system, but you can get it to work okay with bags. And, it fills/empties super fast. But, if you've got the time and money, the ballast puppy system is much more user friendly.
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