Hi guys, new pool owner here. Bought a house with a non functioning pool, took me about 3 days straight to clean. Fast forward, looked like I needed a new liner, maybe skimmers? Pool Company did the liner, reconnected the filter and pump and filled the pool. The plumbing work they did looks like something I'd DIY, maybe worse. Nothing labeled, broken handles for one of the skimmer valves, unknown valves? Anyway, they told me to don't worry about it and everything is fine. Turns out I found out my main drain isn't working, probably closed for a reason right? Then I noticed one day my skimmers was low on water, I called them, they sent 2 guys who did a "pressure test" they was in and out within 20 mins and stuck me with a $450 pressure test bill that said "Pressure tested skimmers, main drain not tested". Then proceeded to tell me there is a leak somewhere along the skimmer line but they can't pinpoint where. I asked about the main drain, they told me it's not needed and it's been closed off. I mean great but, what if I wanted the main drain functionality? A couple hours later I got a quote from them for $6,200, which was to replace the main drain and replace the two skimmers, says labor and material included. I have an older pool from the looks of it, probably neglected. I lose around 1 inch of water every 3-4 days. Can anyone advise anything? I can post pictures of my setup.