Dry acid is sodium bisulfate. It will form sulfuric acid and lower pH when added to water. >Another alternative that won't promote algae growth is sulphuric acid. It is >available in the States as "Dry acid" in swimming pool stores. I would >suspect it is available there also. -Doug Brown debrown@kodak.com ------------------------------------------------------------------------- This is the apistogramma mailing list, apisto@majordomo.pobox.com. For instructions on how to subscribe or unsubscribe or get help, email apisto-request@majordomo.pobox.com. Search http://altavista.digital.com for "Apistogramma Mailing List Archives"!