If the pool is a swamp, there are a few paths you can take. Things to consider when push comes to shove:
Your Time
Your Budget
We can and are more than willing to help you.
The Ozonator on the wall should make as much noise as a florescent fixture because that is what it is except it has a UV bulb. It may have a fan, it may not. I don't know this unit. That it has water leaking is bad. I agree with the earlier posters that say to remove it from the loop. To do that, you will need a replacement pump plug, about $2 at a pool store. Most pool stores have Hayward parts. It will fit, even though you have a Pentair pump, which IMHO, is better than Hayward but that is not what this thread is about.
Reading the pool school and ordering the TF test kit are good starts. Read the Pool School more than once. As you become accustomed to seeing your pool, you be able to more easily identify it's parts, understand it's needs, and see what's missing. It won't come all at once. You will make mistakes. We all did. You can trust what is said here more than the local pool stores word. They want your money, we want you to have a clean and safe pool. Trust your testing.
I noticed the water in the tablet feeder is green. With beginners, I liken pools to artificial life forms. They have a heart (the pump), a kidney (the filter), veins and arteries (the plumbing), they need to be fed (BBB) and have personal hygiene needs (vacuuming and brushing etc...) or they get sick (green) or get guests sick. Your pool is sick.
I have to assume that the system has been off for some time. If you can get us a picture that shows the pool more closely so we can see the water, it would help. Once you get the test kit, posting the numbers will help too.
Hang in there. A little patients and you go from green to clean but it will take some time. Nothing is instantaneous with a green pool.
Talk to you soon.
Scott