Colin writes: > > Does anybody around here knows the way peat reduces the hardness ? > Is it by some kind of exchange like resins ? As I understand it, the carbonate hardness (alkalinity) is redieced by the standard acid-buffer reaction that converts the carbonate to CO2 and H20. THe general hardness is reduced by the Ca and Mg getting bound chemically to the peat fibers. Overall, you end up with more total dissolved solids, but lowered conductivity, because the compounds the peat adds are not ionic in nature. Bob Dixon ------------------------------------------------------------------------- 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"!