Clear evidence of CO2 being a driver of lower pH

[jmichaelh7]

Now add kalk and soda ash and get your ph like this....

Ok !!!

 

[2Wheelsonly]

Now add kalk and soda ash and get your ph like this....

How’s the growth look or are we just chasing numbers here?

 

[Tuan’s Reef]

I'll let these pics speak for themselves. 3 and half month of growth.

 

[Gatorpa]

If you really want to see a good example, use the method people use to decide if fresh air will make a difference.
Take a cup of tank water, check the pH, let it sit for an hour with an air pump and air stone and check the pH again.
Now, take a cup of tank water, check the pH and repeat the above test except this time do it outside. Give it an hour and check the pH again.

For most people, the first test will won't really make any changes in the pH of the water, the second (outside) test can make a pretty noticeable change (assuming CO2 is the cause and your indoor CO2 levels are higher than they are outdoors).

Some of grew up when the impending Ice Age was upon us.

But we are talking about CO2 in our houses which can run upwards of 1000 while outside it’s about 400.