1) take it down (we are routinely below 32degrees, even gets as cold at -17 here, and not sure that's a good idea to leave an Intex pool up in those conditions)

2) city sewer (and a storm drain on the property - we were told last year it was safe to empty our pool into the storm drain as long as we let the chlorine drop to 0 before hand)

3) nope, sure don't. have a brother in law with a big algae problem on his waterfall/koi pond, but I dont' think pool chemicals are safe for those expensive fish! lol)

thanks!