There are simple ways to increase pH if the cause is excess CO2 including reverse lighting a sump with Cheato, running the skimmer intake line outside, 2-part dosing also helps (at least the Alk part) and Kalk dosed top-off water..
I use a simple Soda-Lime CO2 scrubber. It works great (I average a 0.20 pH increase.) It's virtually no maintenance and inexpensive - On my small small tank (~70 gal) and skimmer, the media lasts about 9 months Replacement color changing media (Soda Lime) is readily available. You can use any canister filter instead of purchasing a commercial unit.
For me, it was a simple (and cheap) way to resolve my pH issues that is stable and does not alter other water chemistry (i.e Alk or CA.).
I use the soda lime reactor as well, and +1 on all the comments above regarding ease of use. My tank is in a basement and the excess CO2 can build up, especially if the kids have friends over and they're down there all day and night. I get about a 0.3 pH unit bump (8.0-8.1 up to 8.3-8.4) from using the soda lime (run my skimmer air through a DIY reactor with the media in it).
I started with the 2 Little Fishies product from BRS, but was going through a container every 4-6 weeks (depending on how much time the kids were in the basement) (150 gallon tank). Someone pointed me to this product. Same performance and significantly cheaper.