I have a RO system installed and now looking for the best inline remineralization cartridge to neutralize the pH and increase the TDS for good drinking and coffee water.
Anyone has a good suggestion?

Janika - did you ever get a good answer for your post? Looking for the same.

No nobody has ever responded to my question. The problem with these cartridges is that the remineralization is usually not very efficient and the pH increases dramatically. My last one bumped the pH to almost 10, which is really less ideal. So I was hoping to get some good recommendations.

I use a calcite filter like the one sold from Chris Coffee.

https://www.chriscoffee.com/products/ca ... 7323965476

How did you overshoot so much? Calcite won't overshoot which is part of the benefit/ease

https://www.aquatell.ca/blogs/aquatell/ ... is-systems

My filter was a mixture of calcite and corosex, which would add calcium and magnesium. Was hoping for a better mineral mixture, but maybe it's the corosex that increases the pH so much, if calcite doesn't.

Janika79 wrote:My filter was a mixture of calcite and corosex, which would add calcium and magnesium. Was hoping for a better mineral mixture, but maybe it's the corosex that increases the pH so much, if calcite doesn't.

Corosex contains magnesium oxide beads and does increase the pH and may overcorrect, especially if you measure the water that has been sitting in the cartridge a long while. Limiting Corosex fraction to 25% should help but the simplest is to just stick with simple calcite remineralizers if you want predictable (but low) mineralization. Filters that appeal to the 'alkaline water' faddists are likely to use magnesium oxide to give you higher pH than you'd want for coffee.

jerbear00 wrote:How did you overshoot so much? Calcite won't overshoot which is part of the benefit/ease https://www.aquatell.ca/blogs/aquatell/ ... is-systems
I use a calcite filter like the one sold from Chris Coffee. https://www.chriscoffee.com/products/ca ... 7323965476

+1



P.S.
Here's why magnesium oxide, MgO, bumps up the pH:

MgO + H₂O → Mg(OH)₂
Mg(OH)₂ + 2H₂CO₃ → Mg(HCO₃)₂ + 2H₂O

Note that in the process of dissolving it neutralizes H₂CO₃, which is carbonic acid.

That makes a lot of sense. Thanks. Then I will try a simple calcite filter.