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ahhh the beginnings of a excellent thread..........i did the overflow thingy also, but didn't close the store with it running!!
it cant be as bad as me leaving the hose run all night to fill a demo spa. It was nice to get that call at 10 pm that my store was now a pond.
I can't even say that was an Arctic thing I've done it more than once so I'm really dense....
There's good news though. While fixing the sink I discovered why the drain has been running so slow..... IT WAS FULL OF PENCILSWTF?