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.).
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore, all progress depends on the unreasonable man. - George Bernard Shaw
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