DIY co2 using power head? - The Planted Tank Forum

 
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post #1 of 5 (permalink) Old 01-26-2012, 04:24 AM Thread Starter
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DIY co2 using power head?

Hey I'm just getting into the DIY co2 and have read that you can feed the hose from the bottle to the venturi on a powerhead instead of getting a diffuser of whatever. Having the power head only turn on for a few hours during the day. This seems like a good method if you want to control the co2 "input". My question is, is this an efficient way to disperse co2 onto a 20g? Also, my powerhead is for a 10-30g.
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post #2 of 5 (permalink) Old 01-26-2012, 04:33 AM
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Quote:
Originally Posted by Drewsplantednutz View Post
Hey I'm just getting into the DIY co2 and have read that you can feed the hose from the bottle to the venturi on a powerhead instead of getting a diffuser of whatever. Having the power head only turn on for a few hours during the day. This seems like a good method if you want to control the co2 "input". My question is, is this an efficient way to disperse co2 onto a 20g? Also, my powerhead is for a 10-30g.
It's more efficient than just letting it bleed out through an airstone. Don't plug it into the venturi though, the bubbles will be huge still. Feed the stream of Co2 (preferable through an airstone) into the intake of the powerhead and allow the impeller to chew it up.

This is a good way with a DIY setup. Some diffusers require an operating pressure that is not achievable with DIY setups. Reactors are the best way, but the powerhead method described above has worked very well for me.
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post #3 of 5 (permalink) Old 01-26-2012, 05:44 AM
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Its also recommended to increase the contact time. You can pipe the powerhead output and direct it into your filter intake to allow the co2 bubbles a second shot at turbulent mixing.

The rate of conversion of dissolved co2 to carbonic acid is slow and is rate limiting. Increasing the contact time, fracturing the bubbles to as small a size as possible will help boost carbonic acid levels for your plants.

What is the dKH of your water? Higher values can buffer or 'store' more co2 for your plants and dampen harmful ph swings from night /day for your fish. Kh, co2 and ph tables are freely available and a handy reference.
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post #4 of 5 (permalink) Old 01-26-2012, 06:21 AM Thread Starter
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Thanks man ya that makes more sense.
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post #5 of 5 (permalink) Old 02-11-2012, 12:02 PM Thread Starter
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