Although I agree with Bernd as far as natural substances should be preferred: I, for my part, tend to reduce my pH by using an acid as well. But istead of an organic acid I chose 98 per cent phosphoric acid which I got from a local pharmacy (I was rather surprised that one can by such stuff so easily. And I was even more surprised when the pharmacist sold me 1 litre (!) of it as no smaller packages were available.)
Up to now I mix one pipette drop to five litres of R/O water, reducing the pH from ~6.2 to ~5.4 but with now significant effect on EC (R/O: 30µS, R/O + acid: 30-40µS).
The
PAROSPHROMENUS PROJECT
