What are these tall, uncapped pipes for?

[pj1016]

Can anyone tell me what these tall green pipes are for at my friend's pool? They are open to the atmosphere. The equipment pad is below the pool height-wise.

I don't have any pipes like this at my pool, but my equipment is at the same grade as my pool deck...

 

[JamesW]

Is this in Florida?

 

[pj1016]

No; California.

 

[Brett S]

Unfortunately I have no idea about the pipes, but I did want to say that the amount of erosion under the pad is very concerning. They probably want to get that fixed soon before something gets damaged.

 

[JamesW]

Possibly suction limiting vents.

You might need to put a garden hose in the pipe to see where the water comes out.

 

[mknauss]

Do they have an integrated spa?

 

[pj1016]

Yes; there is a spa. It is above the pool. Come to think of it, the only time I've ever seen pipes like this is when the spa is above the pool...

 

[pj1016]

Unfortunately I have no idea about the pipes, but I did want to say that the amount of erosion under the pad is very concerning. They probably want to get that fixed soon before something gets damaged.

Yes; that is being addressed.

 

[JJ_Tex]

Looks like the pipe for a blower for the spa... a really tall one (I'm guessing because it is below the pool water level).

 

[mknauss]

They are air intakes for the spa. Turn the spa on and I suspect you can hear air being pulled into those lines.

 

[pj1016]

Yes, that's what they must be for - spa air intakes to mount a blower. Thanks, everyone - much appreciated.

 

[mknauss]

No real need for a blower. The system is built to naturally pull in air to mix with the water out of the jets in the spa.