The best choice for freshwater aquarium lower pH?

So the tap water here in Austin is about 8.5 to 8.7 Gh Ph. around 6. I still sprecies several Amazonian fish, so this pH is too high. I would be stable around 7.2. I've been adding small amounts API pH Down to my 46g bowfront, with some success, although I'm trying to take it easy. Thank you for your vision. I wonder if this is the most efficient and remain low stable. Is there a better product out there? As for filters, Aquarium Pharmaceuticals Purifier good reviews, but going for 50 bones and 25 for a cartridge replacement every 150 gallons. I wonder a Britta filter can not be a cheaper option for a similar result. And if I do not use filtering, I'm leaving to open up to fluctuations in pH of the lack of buffer ions?

Peat is usually best to lower your pH.

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