I am picking up an AP running system this weekend.  I got a deal and grabbed it before i had time to learn much about APs.  i was told there is a way to raise and lower PH organically like vinegar and baking soda.  anyone have info on how to do this and what to use?  also, a friend gave me a PH tester they had for their pool.  will that work to test ph and chlorine (i'm trying to off-gas chlorine…