Funny, I forgot to ask about the pros/cons of aerating, but it was answered in the alkalinity link you added. OK, off to walk and feed some dogs (we're pet sitters), then to the store for bleach, distilled water, and more CYA reagent. (Can't afford a better kit until the 1st.) I've never used cal-hypo, and won't use tri- or di- anymore. And thanx again!

odd