is the ultra bringing in new sales or are the tough guard people justmoving up?
seems some big retailer would know
Go to Walmart and compare the number of Ultra filters vs the TG filters. At least for that store
, it will be a good indicator. Also remember, that the majority of those buying filters will tend to go middle of the road (Tough Guard ?) vs the more expensive Ultra ("but it's only a couple dollars more" doesn't mean squat).