They can cut it back to 13/16.
The first number is the leading edge pitch. This indicates the amount of water being scooped into the pump. A lower number means a bigger scoop, which means more water goes into the pump. The second number is the trailing edge. This is the edge that...
Since I had never replaced my own impeller before, I did this little writeup for the Tech section for people like me.
SuperJet Impeller Removal and Replacement
So you've decided to replace that old impeller. I for one am proud of you and your willingness to do it yourself. Let's get started...
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