DIY CO2 Experiment - Page 3 - The Planted Tank Forum
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post #31 of 85 (permalink) Old 12-27-2016, 05:25 PM
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Im no expert on the finer points of yeast but it's my understanding that "Instant" yeast doesnt need proofing, "Active" yeast does.

I always proofed the yeast in a small bowl while making up the other mixture. As long as it was foaming pretty good after 5-10 minutes, I never worried about the particulars.

Once having the sugar and water mixed in the main container, then I'd just pour the yeast mix directly on top, and not shake or anything further after that.

Not sure if that's significant or not, it's just what I did.
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post #32 of 85 (permalink) Old 12-27-2016, 07:26 PM Thread Starter
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Well this is your basic off the supermarket shelf Fleischmann's Active Dry Yeast for baking. I expect it needs proofing, although if the mix is 95F - 115F, you could just dump & mix in the generator container (which is what I did for the 1st batch I made (that's been working well [although mucho yeast]).

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post #33 of 85 (permalink) Old 12-27-2016, 08:17 PM
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Quote:
Originally Posted by AbbeysDad View Post
Well this is your basic off the supermarket shelf Fleischmann's Active Dry Yeast for baking. I expect it needs proofing, although if the mix is 95F - 115F, you could just dump & mix in the generator container (which is what I did for the 1st batch I made (that's been working well [although mucho yeast]).
I would whisk a cup of warm water, 1 tablespoon of sugar and 1 tspn of Fleischmann's Active Dry Yeast. Whisk it every so often for the next 5 or so minutes til its bubbly and then pour it into the rest of the mix. This method always worked great for me. I've never tried just adding the yeast into the mix like you mentioned.
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post #34 of 85 (permalink) Old 12-27-2016, 10:10 PM
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My 2
95-100F for everything.
dissolve sugar in 95-100
1/4 cup of 95-100 and stir yeast until none is left floating and water is really murky, 2 minutes maybe?
Dump the yeast & 1/4 cup in with sugar and shake once to distribute.

Bubbles in 6-10 hours usually.

I have never had a package of yeast that was bad per say.
Cannot count how many bottles made just this way.

Swimming is not that difficult.
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post #35 of 85 (permalink) Old 12-28-2016, 02:04 AM Thread Starter
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It seems to me that if the sugar, baking soda, water is mixed at say 100F, then you could just add the yeast and mix well. Wait a few minutes and mix again - should be good to go with no need to proof separately as it 'proofs' right in the container.
A reason to proof separately would be say if the mix was at room temperature (which might make for a longer lasting mix as perhaps the sugar consumption by the yeast is slower at lower temperatures?)...Then again, it prolly doesn't take long for a mix at 100F ish to get to room temp.

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post #36 of 85 (permalink) Old 12-30-2016, 01:09 AM Thread Starter
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This morning it seemed was clear that my original batch bubbles had slowed way down (1 day short of the 2 week mark). I took my failed batch and heated it on the stove to 110F. After reading some posts (other forums) about the merit of protein powers in the mix (enhancing the performance of the yeast in both bubble count and mix longevity). I added a scoop of 'Organic Greens' to the mix along with a tsp+ of yeast. I mixed well, waited a few minutes and mixed again.
Now the 'Organic Greens' is a dietary supplement with many attributes, but not really a protein powder per se so we'll see what it does in the mix performance.

Within 30 minutes or so, the mix was generating 3+ BPS CO2. I Opened the relief valve slightly to slow it down some. This quick and high rate of production may likely result in reduced run life, but time will tell for sure. I left the 1st container attached until it's totally exhausted.

Later tonight....due to the continued high performance of the new batch, I disconnected for the night and will reconnect in the morning.
I don't know if the high rate of CO2 is too much yeast or adding the supplement.

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post #37 of 85 (permalink) Old 12-30-2016, 01:21 AM
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That is interesting. It probably will run out sooner. But who knows.

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post #38 of 85 (permalink) Old 12-31-2016, 01:32 PM Thread Starter
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Well, after two days the output was still 3-4 BPS while my other container was still yielding a bubble every 2-3 seconds. For the sake of the fish, I disconnected it last night and stepped up the bubble bar to provide more O2 for the gasping fish.
This morning I decided to dump it and start a new batch that would hopefully yield a slower bps, and long lasting yield. (I think I'd rather see 1-2bps)

This recipe:
4c sugar (1lb, 11oz)
1 tsp baking soda
1 tbls organic supplement
4~L water 100F
1 tsp baking yeast

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post #39 of 85 (permalink) Old 12-31-2016, 01:38 PM
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For the sake of the fish, I disconnected it last night and stepped up the bubble bar to provide more O2 for the gasping fish.
Have you measured pH in tank vs. de-gassed sample to determine CO2 levels?

Swimming is not that difficult.
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post #40 of 85 (permalink) Old 12-31-2016, 02:08 PM Thread Starter
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Have you measured pH in tank vs. de-gassed sample to determine CO2 levels?
Not exactly, but I just tested the tank and my filtered (well) tap.
Colors are tough - tank is a very light green (6.6~) while the tap is a very light blue/green (7.2~). I saved the tank sample and will test again later/tomorrow (unless there's a way to degas quicker?). This concerns me a little (as in perhaps too much CO2 in the tank), but I suppose the tank water could be more acidic than my source water. (I prolly should order one of those drop checker kits).

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post #41 of 85 (permalink) Old 12-31-2016, 04:12 PM
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Originally Posted by AbbeysDad View Post
(unless there's a way to degas quicker?).

(I prolly should order one of those drop checker kits).
Air stone in a sample for 30 minutes = de-gassed usually.

pH pen and 7.0 calibration solution would maybe be a better investment.

Swimming is not that difficult.
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post #42 of 85 (permalink) Old 12-31-2016, 04:41 PM
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Use a PH pen
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post #43 of 85 (permalink) Old 12-31-2016, 04:52 PM Thread Starter
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Originally Posted by burr740 View Post
Use a PH pen
Many choices, some inexpensive, others not so much...
What about one like this:


https://www.amazon.com/Digital-Calib...s=ph+pen&psc=1

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post #44 of 85 (permalink) Old 12-31-2016, 05:09 PM Thread Starter
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Degassed looks like 6.8 - 7.0 (more like 6.8), making a .2 - .4 difference (call it .2). Will be getting a digital meter as I feel that the API liquid test / color chart is just to iffy.

So is .2 difference okay or what do we shoot for?

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post #45 of 85 (permalink) Old 12-31-2016, 05:30 PM
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Your Amazon link is the same one I have.

.2 is not much and should surely not bother your fish.
A 1.0 drop in pH is about 30ppm of CO2

(pH de-gassed - pH in tank)*30 = CO2 ppm roughly.

Swimming is not that difficult.
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