I've had an issue with having to PH up all of the time. I use RO water and was using GH's PH Up a few times per day. I finally tried a tiny bit of baking soda disolved in water and used that, and my PH has been far more stable since using it.
Results could vary obviously, and it's not generally recommended over the store bought ph up. But the baking soda also helps buffer the ph, so it's worth trying anyway to see if you can go longer between adjustments.