Uavmx,
jbizzle is right when he mentions that you lose a % of your chlorine per day. Here is the thread where I recently did a test:
Chlorine Dissipation ~ Or Vacation Planning
This may help you to plan so that you can ask your friend to dump some chlorine in at a certain time or day.
Wow interesting. So you averaged around 25% loss per day? I can have someone dump a jug in a couple days. Although I kind of want to let it ride to see where it ends up, for the same type of experiment you did.
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