CO2 injection via filter hose's T-Joint

[FC]

I finally found the filter hose's T-joint that has a diameter 5mm input tube (the other 2 are for the filter hose). See diagram below. Made in Germany by AQ.

filter hose

//
//=== <-- diameter 5mm tube
//

filter hose

This T-joint is made specifically for injecting of air (any type) into tank water.

This diameter 5mm tube can be fitted to the CO2 tubing for injecting CO2. I am thinking of placing this at the inlet side of the filter. That is injecting CO2 via filter. My filter has a pump rate of about 1200 l/hr. Water volume 380 litres.

Any comments?

[bclee]

If you are using a pressurised cylinder, it should be ok. But not recommended for DIY setups. The venturi action will suck the content from the DIY bottle.

BC

[FC]

Since CO2 will go through the filter, will there be PH problem for the filter's bacteria? My filter is 2028.

Thanks.

[Nicky]

FC, do you mind sharing with me where you get this T-joint?
Can I buy one in Singapore?
Thanks.

[FC]

Go to Aquamart at Paya Lebar. It is made by Aqua medic and sell at $4.50. When you enter the shop, go to the right, it is hang on the wall together with marine equipment. It comes in various sizes to suit different filter hose sizes.

[bclee]

I think pH of >4.5 should not be a problem for the bact in the filter.

BC

[NinjaFly]

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If you are using a pressurised cylinder, it should be ok. But not recommended for DIY setups. The venturi action will suck the content from the DIY bottle.
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BCLee,

How about introducing valves to block the action?

[FC]

In any case, I will use the one way valve. bclee, ok, will give a try in my next filter wash.

[bclee]

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On 2/6/2003 1:38:06 PM

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If you are using a pressurised cylinder, it should be ok. But not recommended for DIY setups. The venturi action will suck the content from the DIY bottle.
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BCLee,

How about introducing valves to block the action?
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I think there is no valves to block this. This is in the direction of the CO2 flow. (One-way check valves works the opposite way against back flow.) The venturi will suck the contents from the CO2 bottle into the filter tube. I do not know how strong the suction will be.

BC

[geoffrey]

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On 2/5/2003 5:02:53 PM

Since CO2 will go through the filter, will there be PH problem for the filter's bacteria? My filter is 2028.

Thanks.
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Would you be creating an anaerobic condition within your filter so much so the aerobic bacteria will be wipe out? Aerobic bact. are needed to convert NH3 and NO2 to harmless NO3 while anaerobic bact. converts NO3 to N and O2, right? Am I right?

My other concern would be a buildup of CO2 pocket within your 2028. That will make it noisy, and wouldn't it damage your 2028?

[bclee]

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On 2/6/2003 4:11:07 PM

Would you be creating an anaerobic condition within your filter so much so the aerobic bacteria will be wipe out? Aerobic bact. are needed to convert NH3 and NO2 to harmless NO3 while anaerobic bact. converts NO3 to N and O2, right? Am I right?

My other concern would be a buildup of CO2 pocket within your 2028. That will make it noisy, and wouldn't it damage your 2028?

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Injecting CO2 will not remove the O2 in the water. Therefore, the filter will not become anaerobic.

As long as the bubbling is not too high, most of the CO2 would have dissolved. Many folks on the APD uses this method. They do, however, mentioned about some noise.

BC

[geoffrey]

Thanks BC.