How much CO2 is in your tap water?
My tap water has always had a PH around 7.5. But lately my tanks have been
running over 8, where they used to be around 7.6 - 7.8 in the past. So I tested the KH (5) and PH (7.0) of my tap water, which would seem to indicate 15 ppm of CO2. I'm a little surprised to find it this high during the summer (warmer water). I'm letting a batch of tap water sit, so I can test the PH after the CO2 escapes. I don't know what the KH was in the past, the city water documents no longer list KH or DH. |
"Bill Stock" wrote in message ... My tap water has always had a PH around 7.5. But lately my tanks have been running over 8, where they used to be around 7.6 - 7.8 in the past. So I tested the KH (5) and PH (7.0) of my tap water, which would seem to indicate 15 ppm of CO2. I'm a little surprised to find it this high during the summer (warmer water). I'm letting a batch of tap water sit, so I can test the PH after the CO2 escapes. I don't know what the KH was in the past, the city water documents no longer list KH or DH. Check the phosphate level of your tap. Phosphates can bugger up a pH reading. Djay |
djay wrote:
"Bill Stock" wrote in message ... My tap water has always had a PH around 7.5. But lately my tanks have been running over 8, where they used to be around 7.6 - 7.8 in the past. So I tested the KH (5) and PH (7.0) of my tap water, which would seem to indicate 15 ppm of CO2. I'm a little surprised to find it this high during the summer (warmer water). Check the phosphate level of your tap. Phosphates can bugger up a pH reading. I was under the impression that phosphates mess up your KH reading, not the pH. (As the KH test isn't a test for carbonate itself, but rather a test for buffering, and phosphates act as buffers.) Either way, if there is phosphate in your water, the calculated CO2 value would be off. |
"Bill Stock" wrote in message ... My tap water has always had a PH around 7.5. But lately my tanks have been running over 8, where they used to be around 7.6 - 7.8 in the past. So I tested the KH (5) and PH (7.0) of my tap water, which would seem to indicate 15 ppm of CO2. I'm a little surprised to find it this high during the summer (warmer water). I'm letting a batch of tap water sit, so I can test the PH after the CO2 escapes. I don't know what the KH was in the past, the city water documents no longer list KH or DH. Thanks for the information. Tap water tests 0 for Phosphate, but I was adding it to the tank for the floating plants. So that might explain the PH readings in the tank. I tested the PH of the tap water that I let sit for 24 hours and it's still about 7. So now I'm really confused. Can the KH change with the outgassing of CO2? |
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