For the last couple of days I have been adding Sulfiric Acid (pH Adjust - Down) around 10 drops at a time (total: 30 drops) to 4 gallons on water. The pH has not gone down at all it seems! (liquid test - red chemical 4 drops to 5ml of solution). Im using a bubbler system and the plants seem to be doing fine. The current pH is still around 7.5... How do I lower the pH to around 6.5 to 7!? Also, im adding the pH Down when the roots are still in the solution, is this fine? Its alot of work to lift them up (3 plants in 4 gal rubbermaid)...
Buy some ph down,earth juice has a organic version and there are many other manufacturers of ph down.
