How much chlorine do you usually use? Is it not possible to just tell someone to add say like a half of gallon a day til you return? Even the neighbor or something. Pay them... Everyone likes money. Get some kid, tell him that you will give him $50 if you come back to a clean pool, he has to add bleach every day, if he messes it up, no money. If it is really good tell him he gets $100.