The hose that attaches to the pump is too loose and allows air to be sucked in and prevents the air from being properly removed from the filter. I've seen another reviewer describe a solution to this problem using a wire to tighten the connection, but I don't think I need to go that far. The product has to work. I had to remove the filters as there was no flow. Refilling the filter was made easier with the included fill button.
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