I do. This one is easy. Buy or make a reactor, Fill with pellatized soda lime, connect to skimmer (Air in and out). When it changes color put in new media.
Why do you need one? Meaning what is causing the low Ph, and how low? There are less expensive options depending on your situation. I HAVE to do it. I buy it in a 5 gallon size to make it less expensive.
It’s that link I posted....who is your supplier? sometimes our lingo kills me.