I have a fish room in the basement and the difference you will see by increasing the pipe size will be huge. I bet you do not come close to your expectations. Also, the pump will have to work harder.
I was in the same boat as you at one time. I had a chiller with 3/4 fittings. My flow was terrible. So I had to run second return line to make everything work.
Far cheaper to address the issue now.
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Mike, a NFMAS member.
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