that porter doesnt have a high enough percentage of dark malts to bring it down to the 5.4 range, however as grant said it will bring it down some
you can add calcium chloride to your water, bring out that malty freshness and that will bring you down some too, but i dont know your water profile so I cant tell you how much to add
if you REALLY wanna do it, you can use phosphoric acid, or lactic acid, or citric acid, and lower your pH that way
huge fan of powdered citric acid personally, and you can get that stuff at any animal feed store, and probably your LHBS
you can add calcium chloride to your water, bring out that malty freshness and that will bring you down some too, but i dont know your water profile so I cant tell you how much to add
if you REALLY wanna do it, you can use phosphoric acid, or lactic acid, or citric acid, and lower your pH that way
huge fan of powdered citric acid personally, and you can get that stuff at any animal feed store, and probably your LHBS