I knew that the regular 90s in my plumbing were getting cavitations because I could feel it from the outside. I had >20 90's in my system, so the parasitic drag was huge. Using the swept 90s improved my flow and lowered the back pressure on the pump. The only drawback is the extra length between the regular and swept 90s - it wasn't a drop in replacement for most of the old elbows. In some places I had to use two 45s, but used the swept 90s where ever I could. It took some planning.

I knew that the regular 90s in my plumbing were getting cavitations because I could feel it from the outside. I had >20 90's in my system, so the parasitic drag was huge. Using the swept 90s improved my flow and lowered the back pressure on the pump. The only drawback is the extra length between the regular and swept 90s - it wasn't a drop in replacement for most of the old elbows. In some places I had to use two 45s, but used the swept 90s where ever I could. It took some planning.