Dont use vinegar...get some pH decreaser. It is cheap, safe and effective. The exact amount can be determined with a decent test kit or by using the instructions on the bottle.
22 oz pH decreaser: $4 - $5
1 gal white vinegar: $3 - $4
I'm curious. Why not white vinegar? It's just a solution of pure water and vinegar. It is cheaper than pH decreaser, and is also safe and effective.
I've been using it for awhile without any apparent problems. Or am I missing something?
I'm curious to hear your reasons for staying with PH decreaser. What makes it better?