Cant seem to raise TA or PH

[drbob101]

My TA is persistant at 50 and ph 6.4-6.8. At first I tried just raising the ph with 2 boxes of borax over a 2 day period with no effect. I then tried raising TA with 10 lbs of Leslies Alkalinity INcreasor which is think is baking soda and its has stayed at 50 after 12 hours.

I have brown staining of white pool fixtures and this happened last year and then went away when I think chemistry got in balance.

It is a 20000 ig vinyl and this is the first year for the new vinyl liner.

CYA is 25 and I plan on adding that when I get TA PH issue resolved.

I opened the pool 2 weeks ago and shocked with liquid bleach and used chlorine granules in a sock in the skimmer for maintainence chlorine levels which show .5ppm now

Any ideas woulld be appreciated.