Originally Posted by fishies1234
ok - now I am confused. I tested the two containers of water this morning (the one with sand and water and the other with only water).. They had a 7.6 PH reading. I then tested my tap water and it had a 7.0 PH reading. How could the water (by itself) increase in PH over night?
As nubster said..
Tapwater comes out under pressure and with some CO2 .
After setting overnight,,the CO2 is off gassed and the pH will rise a little.
My tapwater comes out of the tap at 7.2 if I test it right after drawing it.
After setting overnight,,the pH is 7.4 to 7.6.
Good news is,that both of your samples test the same after setting overnight, so the sand is not likely to cause any issues.
Over time,, the pH in my tank drops to around 7.2 through natural process of bacteria breaking down organics. Happens in most tanks, unless buffers are being used to prevent it.