co2 absorption would reduce when it stopped growing imo. Its got a sprawling growth habit so if you grew them on a living wall or a pot tree or even hanging baskets it wouldnt be impractical. To lower the expense of the plants you could propagate them in jars of water. One wall of your house 2 florescent fixtures and some pvc and water. Star
Ya I understand, but keep in mind that approach is still only going to lead to a 10-15% reduction with dozens of plants (best case scenario). That wont likely be enough to impact PH any noticeable amount. The other issue is if your indoor co2 is 1000 it is that way for a reason.... in other words in the controlled experiment they started with 1000 and provided no additional co2 over time. In the real world you will be adding more co2 to the air so you will never actually hit the same reduction as the controlled studies.
I am not trying to be argumentative I just had looked into this long ago and there are several studies and it always seems that in a real world situation there is no real practical application of this. If you want a room full of plants then go for it, but would suggest not doing so expecting a real impact to your PH.