I have a friend with no internet access who asked if I would post the following question:

He lives in an area where the water from the tap has these two parameters (he hasn't tested for KH yet, but I've asked him to). But for the purpose of this post, let's assume that the KH is high enough that CO2 injection is going to change the PH little or not at all.

PH 8.0
GH 13 ppm

Based on a recent thread I had that Vaughn responded to (among others) the suitable range for a planted tank is between 6.5 and 7.5. Since his PH is around 8.0 what should he do to reduce his PH to a suitable level?

Thank you,
Kevin