I have noticed the last week or so using our hot tub the flow was about 65gpm. Today I tried to adjust the flow on the app to 75 and it wouldn't go above about 65-66gpm. I check settings for pump and max flow is set to 100 and max rpm set to 3450rpm. After several tries I switched from GPM to RPM. adjust RPM for around 2000 to 3000rpm and just like it should, flowrate went up to 73gpm. Bumped rpm to 3250 and gpm got and held at 78gpm. Curious as to why adjusting gpm wouldn't make it increase but increasing rpm did.