Even better - stary your system up with your valve on 'Waste' and send that stuff to the drain/sewer/ditch/yard.

It's non-toxic, so I don't think there's any problem with it going to any of the above locations - including into your pool. 6 Gallons in 20,000 gallons of water isn't of any significant concern for that type of chemical. It's designed to easily degrade.