he's a professional researcher.
Then he should be aware of the chemical reaction between CaCO3, CO2 and H2O.
H2O + CO2 + CaCO3 <> Ca + 2HCO3.
He goes on to show his lack of understanding (or Seachem selling skills (pick one)) regarding the carbonate buffering system here.
Baking Soda (NaHCO3): Is essentially just Sodium bicarbonate and will raise KH, but it can easily be overdosed and does not maintain as a stable a KH or pH
Seachem. Alkaline Buffer
SeaChem Alkaline Buffer: This is more straight forward KH buffer that has less added minerals when these are not desired (often by planted or softwater aquarium keepers). Alkaline Buffer will continue to increase pH to 7.8 (or as high as 8.5 with correct usage), however it still is more stable and moves pH much less dramatically than baking soda making it still a much better choice in FW.
Alkaline Buffer™ is a non-phosphate buffer designed to raise pH and alkalinity (KH)
There are two buffer systems in our freshwater tanks. Phosphate based and (bi)carbonate based.
There are so many links to Seachem based products scattered throughout his articles, I'll reserve my opinion thanks.
edit: Here is some more nonsense.
It is also noteworthy that a GH test is not always an accurate measure of positive calcium and other mineral ions (cations), as with many Ammonia test kits, which are inaccurate after using products such as Prime and give false positive for ammonia NH3 as they cannot discern the difference between the NH3 and NH4+.
The same can be said for GH tests that may show a high GH when in reality all positive calcium ions are depleted due to Redox balancing, which is why one MUST constantly supply these mineral cations by whatever means, whether by regular water changes (which often are not enough, especially in small aquariums) or by use of mineral replenishers such as Wonder Shells (which will throw off accurate readings of GH test kits due to their constant supply of positive mineral ions such as calcium!!!).
Think about it for a second. Throw a [censored][censored][censored][censored]load of shell grit in the tank. Does GH rise? Why not?
GH test kits can only measure free divalent cations
in the water. If they are free......................