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No PH change with DIY CO2
"Rick" wrote in message ... "Jamie D" wrote in message news:VX91a.30988$2H6.684@sccrnsc04... "Rick" wrote in message ... I set up 2 liter bottle of DIY CO2 about 10 days ago, mixed up 2 cups of sugar, 1/4 tsp of yeast and a pinch of baking soda and filled the bottle about 3/4 full. I initially had this hooked into a powerhead. It was dispensing as I could see the puffs of gas coming out of the output. I recently bought some Rena Micro bubblers to use rather than the power head and now have the bottle with a fresh mix (last night) hooked into a 4" bubbler in a 20g planted tank. My Ph in the tank remains at about 7.6. I can see bubbles coming out of the bubbler but should the PH not change ?. Is the tank not getting enough CO2, one would think in a 20g that one two liter bottle would be enough, yes, no?? Thx. Rick The amount the pH will change depends on the kH of the water in the tank. The more dissolved carbonates, the less the pH will change. What is your kH? Jamie ~ 50 PPM Rick 50 ppm is around 2.8dKh. At a pH of 7.6 that's around 2 ppm of CO2, which is low even for a non-CO2 injected tank. With DIY I would expect at least 18 ppm of CO2, which would give you a pH of around 6.6. Either the CO2 isn't getting into the tank for some reason, or there is something wrong with your test kits. I personally think 1/4tsp yeast is not enough, I would go with half to 1 tsp - but even so, you should see at least some drop in pH with your set-up as described. My vote is for inaccurate test kits. Jamie ~ |
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