Two pumps, one on the outlet (after filter & heater)?

[Randios]

Hey all, new here, but have lurked before. I recently moved into a new house and the pool filter system has an extra motor, with a valve to cut off the input. I cannot tell for sure where the output of it goes, but it enters the ground parallel to the lines going back to the pool. (picture below):



Any ideas what this is? My best guess is that it's some kind of booster pump maybe? I'm a little worried to run it without knowing much about it, but I'm thinking it will be safe to run it only when the main pump is running.

 

[Jimrahbe]

R,

That is called a booster pump and it is used to drive a pressure side pool cleaner..

If you don't have a pressure side cleaner, there is no reason to turn it on..

1970's technology...

Thanks,

Jim R,

 

[Randios]

Thank you! I had suspicions but it's nice to get a clear answer.

You're also right on about the tech - the house was built in '77