I like my Pentair IntellipH (IpH) acid dosing system. It is a companion to Pentair's IntelliChlor (IC) chlorine system, and the IC must be installed in order to use the IpH.
There are other brands/systems, too, if a Pentair IC is not in the cards. And full disclosure, currently there is a known issue with the IntellipH that causes it and the IC to stop working. Pentair is fixing the problem under warranty, but we're hoping they'll eventually solve it permanently. In the meantime, we can explain how to solve it yourself. Other systems require a bit of DIY as well.
Also of note, since the IntelliChlor stops working in cold water, the IpH will, too. I've rewired mine to avoid that issue, but it's another DIY dealio. Other stand-alone acid dosing systems don't have this limitation, but the IpH has some other niceties unique to it that you don't get with the other brands. Trade-offs.
I, too, have high TA, and without my IpH I'd be looking at dosing acid several times a week. With my IpH, I fill it a few times a year, and it maintains a very stable pH every hour. So now that I've got its few foibles figured out, I wouldn't be happy without it, nor would I trade it for another brand.
I can give you more details if you want to go down this path...
