First of all, welcome to the forum. You have come to the right place and we can help you get this cleared up. (BTW -- I merged your two threads to keep it all together. After you post, if you think of something else you need to add or need to fix a typo or whatever, you can click on the edit button in the lower right instead of starting a new thread.)

If your pH is at 7.2, that is fine for now. Actually, when you are fighting algae, that is a good level. You can bump it up a little after the swamp monster is tamed. Just keep an eye on it and make sure it stays above 7.0.

Unless you have added water, your cya would not have dropped. Who knows how high it really is. Testers typically only go to 100 so there really is no way to differentiate 100 from 120 from 150, etc. The only way to lower it is to do a partial drain and refill. (But do NOT totally drain a vinyl pool.)

You are underchlorinating. With a cya as high as yours is, you need to be shocking up to 25. Adding chlorine once a day isn't gonna do it. You need to be testing and adding as much liquid chlorine as you need to get back to 25 ppm as many times a day as you can. The key to killing algae is to sustain the high cl reading. A minimum of twice a day at the very least and more often is even better and will clear this up even faster. In your pool, a gallon of 12.5% liquid chlorine will add 3.3 ppm of cl.

Especially if you are gonna run high cya levels, you need a good test kit that will test high cl levels and also will test cya. We recommend the Taylor K-2006. If you get it at Amazon through the following link, Pool Forum makes a little money in the process.

http://faq.poolforum.com/products

BTW -- What is the ingredient in the super shock you are using? If is dichlor, you don't want to use that. It is also stabilized and will further add to your cya issue. Just stick with liquid chlorine.

Phosphate remover is the latest wallet depleter pushed by the pool store. You don't need it.

Run your pump 24/7 while you are fighting algae. And, uh ........... I don't think the viagara is gonna help! Repost with further questions and let us know how things are going.