Slide plumbing to pump return

[japhead]

Just bought a slide and would appreciate any info on the plumbing side of it. I'm gonna have to drill in the concrete deck to put in a stub then dig under the deck to reach the stub and of course go to the pump the other way.

Not sure how to hook into existing piping on the return line? I want to use water from the pump and also have a way to control off and on and water flow to the slide. Also heard I need to maybe install a union joint on slide side so water can drain out and not freeze in winter. We blow out the pipes but of course the one will be going up instead of down in the slide. Attached are a couple pics. Any info would be appreciated.

 

[HermanTX]

You can add a Tee fitting either before the filter or after heater along those long stretches of pipe - either is easier than adding after the SWCG.
From the Tee fitting you want to add a 2-way valve as that will control flow to the slide. Then after the valve you want to downsize to either 1” or 1.5” pipe to the slide. . Some also put a 2-way valve at the base of the slide to make it easy to turn off if you are in the pool.

You will need to play with pump speed when you want to run the slide as well as continue to return flow to pool.