If it ain't broke, don't fix it.
I am having a hard time understanding why you made the switch.
If I were you I would go back to tap water immediately. Adjust the pH to 6.8 and do whatever you were doing before when you say your plants were fine. At this point, if you think you are having a deficiency, why would you flush even more?
stinkyattic Reviewed by stinkyattic on . reverse osmosis machine help asap appreciate all the help 5 sk no1 and 5 mk from seeds soil 13,5L pot(60%copmst40%perlite ans some garden lime] 7 weeks in to flowring 2 or 3 more weeks to go tap water ph 7.5 adjust to 6,5 using ph down and the ppm of the tap water is 1500. been feed with bio grow/bloom 1/2 dose NOW THE PROBLEM every thing was ok till 2 days ago when i water the girls 1 liter each of pure water using reverse osmosis machine (ppm 0 and ph 7 adjusted to 6.5 using ph down)only 1 L of water and after 24hrs Rating: 5