[Ed]

The pH in bromeliads can range down below 3 in the carnivorous bromeiliads and ranges as low as 4.5 are not uncommon in other bromeliads. You can see this is a wide variety of the studies including this one http://www.sblimno.org.br/acta/my_web_sites/acta_limnologica_contents1801E_files/Art05_18(1).pdf

Google Scholar is a wonderful tool..

Ed