Chlorine Lock ?

[Big Splash]

Agreed, draining isn't the only option.

[mjsboone]

Back home. Pouring down rain here.

I have tested again. Using the 10ml. sample I added 1 scoop powderand it turned really pink then added37 drops of 871 until clear, multiplied number of drops by 0.5 which equaled 18.5. I then added 5 drops of 003 and sample turned light pink. I then added 4 drops of 871 and it became clear. Multiplied 4x0.5 =2

Last added bleach Weds. night. 5 jugs. Then got scared...I have bleach to go in pool if I need to do that. It just seemed like everything was way out of wack. Water is clear.