Hi water experts, I have a pressing question:
My water company switched to groundwater about a month ago due to finding a parasite in our typical water source (bull run reservoir). The water properties are quite different, with Bull Run being much softer and lower in pH.
Bull Run - 6.8 pH, <1 dKH, 2-3 dGH
Ground Water - 8.2 pH, 6 dKH, 7 dGH
When the change to groundwater happened, it stressed my discus for a couple days as I did 50% daily changes. My concern now is, how to change back to Bull Run considering this time I will be going to a much lower pH, which I understand to be much more stressful for the fish.
Maybe just a series of small water changes throughout the day?
I went ahead and did a 50% wc. I added a little baking soda in the middle of the refill to ease the stress and bump up the KH. The fish acted just fine throughout.
just saw this, but you did what i would have done.
small changes to ease the transition
Sorry for a delayed response here Eric .
I wonder how did the transition end up ?
To tell you honestly with a PH diffrrence with a downward swing of 1.4 degree I would have gone with a lot less water changes than your initial 50% , but it seems that your discus ,on my amazement , have accepted the pH drop of 0.7 degrees just fine .
One tbsp in how many gallons added. That is a significant fact you left out. So what was the tank ph before and after the 50% water change?
People often make incorrect assumptions in regards to pH.
Many would think the following:
50% water at a pH of 6.0 + 50% water at a pH of 8.0 would equal a mixed value of a pH at 7.0.
However, this is not the case at all. Quite often mixing the two will result in a pH much higher than this, if there is a change at all.
I am actually quite surprised in this case it worked out that way, are you sure?
Last edited by nc0gnet0; 03-25-2017 at 08:15 PM.
SOS Crew-MichiganPresident North American Discus Association
When you mix water having a strong acid and a strong base, and there are no buffers involved, adding half pH 6 and half pH 8 would result in pH of 7. The H and the OH would combine to form water.
But natural water is different, it is buffered by carbonates and (mostly) bicarbonates. As you add the acidic water to the higher pH water, the carbonate alkalinity (KH) within the more alkaline water consumes the acid so that the pH will only go down slightly.