Do you know what your Kh and Gh are? If you have 8.2 ph chances are you have hard water with a high Kh and Gh, that’s not written in stone though. You could have a high ph and a really low Kh. I ask because a high Kh will buffer your water and the ph will remain stable even if you put wood and almond leaves the ph won’t move. So if you do have a high Kh what Russelltheshihtzu suggested above would be the way to go.