Other than using RO how can I lower my KH?
My 14g planted with DIY CO2 (Hagen Natural Plant system) has a KH of 15 dKH. pH is 7.0 and CO2 of 45 ppm.
This tank is heavily planted and has been set up for several months.
My 55g planted tank has a KH of 11 dKH with a pH of 7.2, giving me CO2 of 20.822 ppm which I am happy with.
I tested the water out of the tap and it took 11 drops for the color to change.
I also tested the water from a nearby town with a different water source and it only took 3 drops. Also, I used two different test kits and all results matched.