I would use a threaded plug while you are in the troubleshooting phase, until you are sure the problem is isolated. With pictures of your pool area and equipment pad we can help you figure out how to repair the problem. Do not use fix a leak! It could cause more problems than it solves!
Getting screw in eyeballs would be a good thing to have, so you can direct the flow of water around the pool, however that is a low priority item right now.
EDIT: Thanks for the equipment pad photo. I can kind of see something written on the pipe with the valve on the right. Can you see what it says?
The 2 lines without valves are the return lines that go back to the pool. Are those black rubber hoses going into the ground, or painted flexible pvc? I know the couplings are black rubber. Since there is no valve you will have to plug them at the return fitting in the wall of the pool. Plug one at a time and see if you can isolate which return is leaking.
How far away from the pool is your equipment pad? If it's not too bad you could always plumb a temporary "above-ground" return into the bad line until you get some relief with the other issues. I'm not a plumbing expert so there might be something wrong in my idea, but as long as the height works out to prevent siphoning it would be a way to prevent pressure issues by only running a single return.
Awesome, glad it worked! No need to figure out how put a jet on there, you could literally just keep adding on to the pipe, even split it so one part keeps surface movement and another goes deeper into the water to circulate there. Possibilities are endless!![]()
If there's still debris on the bottom, you might want to try a leaf rake. I'll post a video, but the way they work is that you slide it along the bottom, with the net down and the leading edge of the rake scraping along the bottom of the pool. You push it as far as you can, and then simply pull back. The net seals off, holding whatever has been picked up, which you then dump somewhere, and go again. You kinda cover the bottom (somewhat blindly) the same way you would cover a floor with a vacuum cleaner. Leaf rakes are quite inexpensive and fit on your regular telescoping pool pole.
How To Scoop/Remove Debris From Bottom Of Swimming Pool - YouTube