vta said:Whenever it was time to change out the res, I would just refill with R/O and a little Clearex and run that for a day...then back to FN.
i also give them a flush when ever i refill my tank. but i only flush for 10 or 15 minutes and then i add nutes to the tank and let it go back to automatic watering. but either way, one dilutes the salts and can give more fresh nutes.