Unfortunately, pool store test results are designed to sell chemicals. Hope you didn't buy any of that stuff!! You don't need the stain and scale, so ignore that. What type of pool finish is this pool made from? If it's vinyl liner or fiberglass, you also don't need the calcium hardness. The alkalinity increaser is the same as baking soda, just with a higher price tag. You probably won't need much of it, either--because when you bring the pH up, the alk will also come up some. What they didn't tell you is that your pH is low--most of the tests only read 6.8 on the lowest end, so that means your pH is 6.8 or lower. You need to get that up to at least 7.0, by adding Borax (plain, 20-Mule team Borax from the laundry aisle at WalMart). I'd start with about 1/2 box, added slowly through the skimmer with the pump running, breaking up any clumps. Give it a couple of hours to circulate, then add more if you're not above pH of 7.0. I don't know what "shock" they tried to sell you--but your CYA is already high, and you don't want to add anymore, so I wouldn't use any pre-packaged shock, and certaily wouldn't use any tabs, since they all will increase your CYA further. As it is, your chlorine is already too low for your CYA level (check out the "best guess chlorine chart" linked in my sig for more explanation and the chart), and since your CC is so high, it looks like you still have a bit of mess to clear up. With a CYA of basically 100, you need to bring your chlorine up to 25 ppm and hold it there by testing and adding more bleach as necessary to get back up to 25 ppm. You need to hold it there until you can test chlorine at night and again in the morning, and not lose more than 1 ppm of chlorine in that time. So--in order to do that, you're going to need to be able to do your own testing, since the pool store isn't likely to be open at dawn! That's why we recommend that people get their own kit and do their own testing (well, that..and the propensity of the pool stores to try to sell you a bunch of stuff you don't need, like they did to you!). Once the pool clears up, and you're no longer losing chlorine overnight, then you can let the chlorine drift back down again--but with a CYA of 100, you can't let it get below 8 ppm or you'll be risking another algae bloom.

At that point, your friend will need to make a decision--run high CYA pool with high chlorine levels to compensate? or drain/refill part of the water to bring the CYA down, and don't use any more stabilized chlorine?

Janet