We installed a Flojet variable speed pump on our NorthTrail, because the OEM was so loud. When we got the new ElkRidge, we immediately swapped the pump for the Flojet again. I really like the consistent flow, and it is definitely quieter. Makes a "gradual growl"during demand, rather than a loud pulsing ON-or-OFF. We kept the old pump "just in case". No worries after 4+ years.