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Discussion Starter · #1 ·
Hey all, sorry if this question has been killed many times over, but I was wondering if you guys wait until the bubbles run out before preparing the solution, or get one ready at certain intervals (ie 2 weeks). My pH goes from 7.4 to about 6.8 with injection, so I was a little concerned about the sudden pH swing upwards when the injection stops, and the sudden swing downwards after the new solution kicks in. Thanks
 

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when injecting co2 into the tank its normal for the pH to drop. 6.8 is fine.

It depends on your mixture, I use sugar, water and bread machine yeast and change it once a week regardless. I actually just "T" on another cannister and it dropped my pH to 6.0 wish is kinda low. You can use baking soda to raise the kh which will raise your pH. Its a process of finding out how much to add in your tank to keep the same reading. For example, 20 scoops the first time and after a 20% water change maybe 5 scoops? It varies from tank to tank.

Also, I see no other point in waiting out the entire co2 cannister life other than if you are extremely strapped for cash and cant afford extra sugar and yeast.
Keep that co2 pumpin in your tank, your plants love it.
 

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Discussion Starter · #4 ·
Thanks for the responses guys. My normal tap water kH is about 4.0, so I add a smidge of baking soda to get it to like 4.5 or 5. I think I read somewhere that the bubbles will die off very quickly, so I thought that may send a big jolt into the system, followed by another when the next solution kicks in, but I guess not. The problem I have now is I'm still on my first batch, so I have no clue how long it will last, since i have a pretty cold house, so I had to use almost 2 teaspoons of yeast to get thing's going. I'm not sure how it all will balance out, so it could be another 3 weeks or it could be another 3 days, lol.
 

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as long as co2 is being added to the tank the ph will drop and stay at a certain level. in your case 6.8 is fine and i wouldnt worry about it unless you have fish that absolutley cant live in it.

how big is the cannister you are using? Is it just the Haggen brand? How much sugar, water and yeast is added to the mixture? Like I said with mine it will probably last 10 days without any baking soda added. But I change it every week to insure I always have a good flow of co2 in the tank
 

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Discussion Starter · #6 ·
I was more concerned about the pH when the bottle runs out, and when the CO2 kicks in after I put in a new solution. I'm currently adding 1/4 teaspoon of baking soda, as recommended. The rig is just a soda bottle with an airstone that feeds into the intake of my HOB. I added 2 cups sugar, 2 teaspoons of yeast, 1/4 teaspoon baking soda and filled to 2 inches from the top with distilled water.
 
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