Is this a good idea? (pure hydro)

I've read alot, here and elsewhere, I have a question.. If I may...

I read of this poster that did his "flushing" in this way; He ran his ph level down to 5.2 during what he figured to be the last 2-weeks. Effectively locking the nutes... and thereby making only H20 available to the plant.

Can you share you thoughts on this please?
Thanks

I think it's ridiculous, but then I'm in a bad mood today. First, taking pH to 5.2 does not "effectively" lock out nutes. it might impede nute uptake, depends on the nutes. But why bother putting nutes in your water so you can try to lock them out? If you want the plants to have only water give them only water. What the hell is the matter with some of these people? Oops, there I go being in a bad mood again, sorry. Don't do it. Flush means plain water.