I'd also recommend trying to remove the filter trap and clean it manually every so often. And maybe run vinegar and then afterwards baking soda if money becomes a bit less tight. Neither is really helping the pH as the primary goal, it's about breaking down the mineral buildup inside.

Also, run a cycle on sanitize every month or so if your dishwasher has that. It runs hotter and longer, and some dishwashers are made to run that cycle regularly for self-cleaning purposes.