You can most certainly just use plain, unscented bleach as your source for chlorine. Many of us do -- me included. But, there is more to it than just adding a couple of cups per night.
Needed chlorine levels are based on your CYA reading. With a CYA of 50 that you reported above, you need to keep your chlorine between 3-6ppm ALL the time. So, you test your pool each evening to get the chlorine reading and then add however much bleach you need to get your chlorine level back up to around 6ppm. For reference, in your pool each cup of 8.25% bleach should add around 0.7ppm of chlorine and each quart would add around 3ppm.
More info about the CYA and chlorine connection can be found here:> http://pool9.net/cl-cya/
Hope this helps.
Bookmarks