Yes, go ahead and add more Borax, until you get that pH up above 7.0. You can take a sample to the pool store if you want to, but be aware that they're going to try to sell you a bunch of stuff you don't need--RESIST, no matter how hard it seems !!

Or--you can go to WalMart and pick up the 6-way drop kit that they have for about $20 and probably do as good a job or better than the pool store...

Janet