So hydro have been incredibly fun to mess around with, up till now : I've hit a problem I can't fix.
Following some high pH issues I ran a flush a couple weeks ago to change out the system. Following that was added in RO water with nutes pHed to 5.5. Since then I've been topping off with 200 ppms tap, mixed with nutes prior to adding. Once I had to do some playing around with pH down was done to bring the res from 6.5 to 5.5(ppms were at 1100 already) once - no idea how it shot up.
Now the problems :
The pH keeps jumping down to 4.0 as water levels drop. I refill with dechlorinated tap(pH 7.5), no nutes, and ppms rise to 4.2-4.4, ppms 800. Then I adjust with pH up to bring it between 5.3-5.6.
The next refill pH is back LOW; this has been happening the last 3 times with nutes kept at 600-800 instead of 1100 ppms.
What can cause sudden reservoir acidification? Could it be the EWC tea I add a cup or two of every 2-3 days? But its pH is at 6.1-6.3 on addition.
Could the one addition of pH down I did have screwed everything up since the last flush? (it should be neutralized by the many additions of pH up so far..)
Ran a flush
Filled RO + nutes : pH 5.5
Fixed pH issue 6.5 with pH down week after flush
cup of EWC tea every 3-5 days added.
Top off res with 200ppm tap and 700 ppm nutes pH 5.5-5.8 - use flora nova bloom
Now pH shoots downwards before every refill to 4.0, battling with pH up and alkaline tap water, 3 fills later its still an issue.
Edited by 1sttimegrower, 26 May 2012 - 10:16 PM.