Thank you - but please bear in mind that you are dealing with a complete novice without any knowledge of chemistry...

I have searched around on the forum, but I'm still not sure. To get the chlorine level to 8-10 ppm, do I need to add about 1.5 gallon of household bleach? Should I do this in the evening, but while the pump is still running? (I already removed the floater.)

Thank you for your patience!