re: Cardboard Flowerbox Test 3 - 41 Week Perpetual SOG
id like to add to this by saying 5.6-6.2 will work but as jandre stated 5.8 thats the magic number as far as the most optimal number but as long as you stay in the range i said it should be ok, but ill also add during flowering phase when your bumping up and changing the nutes the ph usually goes down alot well for me it does so always have your ph up/down available
5.8 is ideal for Hydro/DWC
Best to check Hygrometer with an inverted pop bottle cap 3/4 full of salt. Pour enough water to make it a paste, not a soup. Place cap and hygrometer into a Zip Top Bag, seal and leave for 12-24 hours. If it reads 75%, you're good. If not, either calibrate, or write the variance on the meter so you can have accurate readings.
id like to add to this by saying 5.6-6.2 will work but as jandre stated 5.8 thats the magic number as far as the most optimal number but as long as you stay in the range i said it should be ok, but ill also add during flowering phase when your bumping up and changing the nutes the ph usually goes down alot well for me it does so always have your ph up/down available