uncleof6
Active member
Spa flex is also a good idea. One disadvantage is you cant really press fit for experimentation. You have to glue it. 1" pipe may be better. It may be worse. It is big enough to handle the flow you are running. The pipe would be more "full" than the 1.5". You will have to experiment and see what works.
Because it is an air/water mix drain, the smaller pipe will simply increase the velocity inside the pipe, and aggravate the problem. With air/water mix drains, the larger the pipe the better. You can't beat the physics. To solve the issue, the velocity needs to be lowered, either by dropping the flow rate, or INCREASING the pipe size. Not many are willing to use 2 - 3" pipe on their systems.
Jim