Clearex or Florakleen will help remove the extra chemicals FASTER.....i just plain love that word.....faster.....quicker.....sooner....all variations of heaven to my ears.

At four days in I doubt you will speed the process up really at this point. I was taught to flush by the same instructions as Zandor's post.....watching the amount of ppms daily and you'll see them rise quickly as the flushing agent does its work then you change the water daily to keep a record of what's coming out. After a few days (depending on the dose you use) you will no longer see the ppms rising and the flush has done its job. Then I switch to plain RO water for up to two week until finish.

I especially suggested it for cm because I think he's honestly just a few days away from harvest and this will indeed be a lot quicker. I don't have any quarrel with folks using plain water for a week or so to accomplish the same thing and yes, I think it will work just fine. I remember Rhizome telling me he would do water changes during flushing (plain water I believe) to keep his ppms under 300. I would have to agree that that would be alot less work than keeping track of your numbers and making changes every day......the trade off being the amount of time involved.

The other time I strongly urge using flushing agents is several times during your grow for a 24 hour period to help clean out excess fert salts built up in the system and the medium etc. That practice has made a BIG difference in my grows.