OK. I went back and looked at your other thread to find out info about your pool. You have approximately 13,500 gallons. In this sized pool, each quart of 8.25% bleach will add about 1.5ppm of chlorine. You can use that as a reference to help you figure out doses of bleach to add.

Since your chlorine dipped below the minimum needed for a pool with a CYA of around 60, and since you have a CC reading of 0.5 (ideally it should be 0), I am going to suggest that you shock your pool. If you look at the Best Guess Chlorine Chart that Dave mentioned, (in my signature below), you will see that you need to shock up to 20ppm. Go ahead and add the bleach today since yours is already too low. Then, this evening after the sun is off the pool, test again and add enough bleach to get the chlorine level back up to 20ppm. After you add the bleach, wait about 3 hours and then retest chlorine levels and make note of it. Then, tomorrow morning, test chlorine levels again within two hours of sunrise and see how much you lost overnight. If you lose no more than 1ppm of chlorine overnight AND have a CC reading no higher than 0.5, then you can let the chlorine level drift back down. If you lose more than 1ppm, shock it again. You need to keep the pool at shock level until 3 things occur:

1) You lose no more than 1ppm of chlorine overnight
2) You have a CC reading no higher than 0.5
3) The water is clear

From that point on, you need to make sure that you keep your chlorine between 5-10ppm ALL THE TIME! To do so, you need to test your water every evening after the sun is off the pool. Add however much bleach you need to get back to 10ppm. The goal is to find out how high you need to take the chlorine so that you don't drop below 5ppm before the next bleach addition. It may be that you will find that you can get by with adding bleach only every other day instead of every day. But, for now while you are learning how your pool operates, you need to test the water every evening.

I know it sounds high, but a chlorine level between 5-10 in a pool with a CYA reading of 60ish is not high. It is fine to swim with it at that range.

As far as pH goes, yours is a little low, as Dave noted, but nothing severe. I think his idea of a cup of Borax, wait a few hours, retest and redose if needed is fine. You should tweak your pH before you shock the pool because high chlorine levels will make pH readings inaccurate.

Daily tests should be for chlorine and pH. You can check ALk every week or two unless your pH becomes unstable. In that case, check the ALK a little more often. Unless you add a product that has CYA in it, you don't need to test the CYA. Be sure to wait at least a week after the addition before retesting it though. Since you have a vinyl pool and are only using bleach (I think??), you don't need to worry about testing calcium hardness.

Hope this helps!

(By the way, it helps us if you will make a signature line and put all your pool specs in it. That way, when people answer your posts, they don't have to go and try and search and find out what kind of pool you have and volume, etc.

You can make a signature by going to settings (which is in the upper right hand corner near where you sign in) and then on the left side will be an option to create a signature. Put type of pool, volume, size of pump, type of filter and the fact that you have a K-2006. Thanks.)