No, Baz means ph swing over the course of a week or longer. Learning ph management is something you just have to work at but once you "get it" it makes perfect sense. When you add fresh nutes to a hydro res the ph goes down. When you add water only ph goes up. Use this rule of thumb to allow ph to move all around the 5-6 range. Otherwise, you'd have to add a pretty big serving of ph up/down to the res to get the big swing you're asking about and your plants will not like it. Let ph move naturally, then use ph up/down only when necessary to fine tune ph.