Swimming Pool Start-up and Closing

[Miguel W]

I am trying to understand my pool’s plumbing. When my pool was closed for the winter two years ago (I didn’t open my pool last summer), I believe that the three grey inground pipes (see photo) all had their caps unscrewed and removed. Yesterday I removed the cap on the far left pipe and nothing happened. Next I removed the cap on the far right pipe and water gushed out. I screwed that cap in as I was afraid that not doing so would result in the emptying of my pool. Nite that the pipes are located down a hill, about 30 feet from the pool, and are about 8 feet below the top level of the pool. The other photo shows the above ground piping next to the three parallel in ground pipes.
Thank you for your thoughts,
Michael

 

[ajw22]

Miguel, you are missing your equipment which I drew in to make it clearer the way the water flows.

I also labeled A through D the four plugged pipes and 1 through 3 the three shutoff valves you have.

Now please explain using those markings what you did.

 

[Miguel W]

I apologize for not responding sooner. B and C are my heater connections and A and D are my pump connections.
Thx

 

[ajw22]

Welcome back.

What can we help you with now?