Potassium Bicarbonate buffer:
Make a 300g per 1 liter solution.
dose 30ml per 40 US gallons / 151 liters to raise KH by 2 degrees (dKH) = 36ppm
Recommended levels are between 2.8-5.6 dKH or 50-100ppm
This also raises potassium by 23mg per liter or 23ppm
*apply this dosing volume to the TRUE amount of water taken out and put back into the tank each week, and not the total tank volume! It is preferred to use RO/DI water. For unbuffered water or in the absence of CO2 injection, use 1/4 to 1/2 dose to avoid impacting pH. I run my tank at 3KH, 6-7GH, with a 6.6 pH.
And these are all really guidelines because each tank is different and we are not always consistent. So, always test the KH of your water when first getting down a routine. After a routine is established you can check every month or so to make sure you are still on track. Sometimes your KH can accumulate if you did a tap water evaporation refill, or dosed too much one week, so always monitor your KH, but truly in this situation it is alkalinity considering we are not using calcium bicarbonate or magnesium bicarbonate.
I hope this helps.
You can get potassium bicarbonate off of Amazon for super cheap, and it will last you a few years. They use it in wine production.
Last edited by DaveFish; 09-29-2015 at 06:49 AM.
Reason: more info