Ha ha....exactly. I'm not sure how accurate it is because I feel that the reading would change every time I did it, mainly because I'm so new to it.

I am definitely doing bleach...trichlor and dichlor is what got me into this mess.

I was thinking about 75% as well, which is what I thought I did the first time I did this, (about 3 months ago), but I guess it wasn't enough.

Thanks.