Since many aquarians and pond owners do not really understand how important the carbonate hardness is and how its puffer action functions on the pH value, JBL has added a video with subtitles to the JBL home page and published it on YouTube.
The short film illustrates in one simple test how in soft water the pH value plummets with only one drop of acid! Subsequently carbonate hardness is added in the form of JBL AquaDur and anew acid is added dropwise. Now it can be seen clearly that the pH value does not plummet anymore but remains stable.
Every pet shop sales assistant, aquarist and pond owner can conduct this test by themselves in just a few minutes and consequently understand how carbonate hardness works.
More: JBL AquaDur