Spa/Pool Pipe Size Question after reading Hydraulics 101

[mas985]

Can you post a link to the site you are looking at?

In the picture above, the two open circles are for the air line (top) and the water line (bottom). The nozzle is usually positioned right below the air line connection.

However, for the polystorm, I believe, the wall fitting extends both the air and water lines forward and the "jet internal" is where the orifice is located. Close to where the thread is located.

 

[markmac]

That image was the 2" model, but they have the same diagram, with more detail for the 2.5". The way I'm reading it, the Flow is dictated by the jet internals/insider, and not the Jet Bodies. So I'd order X# of Jet Bodies as they're all the same, and then select the Internals I want, based on flow. The 2.5" models all seem to be 5/16th, whereas the 2" models have the selection of Flow for the "insider" jet (1/4", 3/8" and 1/2").

CMP - 2.5" Gunite Spa Jet Bodies
CMP - 2.5" Gunite Jet Internals

CMP - 2" Gunite Jet Assembly
CMP - 2" Insider Gunite Jet

 

[markmac]

@mas985 , in the links above, am I correct the Gunite body would all be the same, and the Jet internals dictate the flow rates?

 

[mas985]

Yes, except I am not sure if you can use 2" jet in a 2.5" housing. I would pick one or the other.

 

[markmac]

Thanks. Yes, I was planning one or the other, but noted the 2” line of jets offered the variety of different flow rates.

One more random question when preparing the hardware list. For the main drains in the Spa, if I’m targeting 100-120 GPM, should I be looking at the HF drains like these that have max flow rate of 138 GPM with 3” pipe.
High Flow Dual Sump Drains

Or will regular 8” diameter ones be sufficient? Both show they’re capable, but just capable on the 8”, Rated for 125 GPM With 3” pipe.
Standard Dual Sump Drain

 

[mas985]

8" diameter is sufficient. They spec those based upon a single MD carrying the entire flow rate which is highly unlikely even under blocked conditions.