Reef Buffer for alk

[04V10]

Hey guys,

I'm just curious what i should do. I am almost empty on my red sea foundation b that i have been using for my alk, and my wife was to pick me up another bottle, but they didn't have any and they sold her seachem reef buffer. It says on the bottle that it raises pH to 8.3 but also raises alk. Then on their website it says that you should use reef builder for alk control. Should i still use this? I'm not close to a lfs so earliest i could get some is Sunday, and I'm going to run out on Thursday.