My wife and I purchase our first home last September, it came with a pool that had been "professionally" closed at least 3 years ago.
Photo of covered pool from last summer sometime:
Fast forward to last Friday (I ordered my TF-100 Test Kit on Thursday) - I come home to find my pool has been uncovered, the level lowered, and my pump/filter is running
Found an invoice in the mailbox from a local pool company - my address on the paper but not my name (previous renter maybe?) Anyway I have not been able to contact the pool company due to the holiday weekend so I have no idea what they did or didn't add to the pool. So far I have just been vacuuming and back flushing the filter and adding water of course. I also patched a few cuts/holes in the vinyl liner that were above the water line. I'll post back tonight with my initial results from the TF-100 and hopefully I can get pointed in the right direction.
Friday (5/23/14) photos:
Pool is approx. 30x15x5 (I'll get better measurements too)