slamming in the evening?

Do it! Jugs away now, and again just before bed. And then hit it again before you leave for work in the morning.
Hit it hard, again and again.

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SLAM it, SLAM it good :cool:

Nice thing is all the chlorine goes to killing the green and none lost to the sun ;)
 

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Usually 20 minutes is good, it's the minimum. I usually recommend 30 minutes just to be sure. In your case if you were at the short end of 15 minutes maybe it wasn't mixed and that's why you tested at 27. As Pooldv pointed out the math isn't adding up.
20K and 10% the three gallons should have given you about 16 ?? If it really was 27 did a lot of algae killin' overnight ;)
 

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