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Retirement and forum shutdown (17 Jan 2022)

Hi,

John Howell who has managed the forum for years is getting on and wishes to retire from the role of managing it.
Over the years, he has managed the forum through good days and bad days and he has always been fair.
He has managed to bring his passion for fish keeping to the forum and keep it going for so long.

I wish to thank John for his hard work in keeping the forum going.

With John wishing to "retire" from the role of managing the forum and the forum receiving very little traffic, I think we must agree that forum has come to a natural conclusion and it's time to put it to rest.

I am proposing that the forum be made read-only from March 2022 onwards and that no new users or content be created. The website is still registered for several more years, so the content will still be accessible but no new topics or replies will be allowed.

If there is interest from the ITFS or other fish keeping clubs, we may redirect traffic to them or to a Facebook group but will not actively manage it.

I'd like to thank everyone over the years who helped with forum, posted a reply, started a new topic, ask a question and helped a newbie in fish keeping. And thank you to the sponsors who helped us along the away. Hopefully it made the hobby stronger.

I'd especially like to thank John Howell and Valerie Rousseau for all of their contributions, without them the forum would have never been has successful.

Thank you
Darragh Sherwin

venturi

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19 Mar 2008 01:04 - 19 Mar 2008 01:07 #1 by suckers (matt lait)
venturi was created by suckers (matt lait)
ok here's a bacis/Physics/'aqua-study' question.
Does any one know how deep a venturi will work to produce bubbles?
If the bubbles have to travel down a pipe then back up again(see diagram) where would the best place to put the venturi be? at the filter or nearer the heater chamber?

matt
Last edit: 19 Mar 2008 01:07 by suckers (matt lait).

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19 Mar 2008 01:17 #2 by Daragh_Owens (Daragh Owens)
The flow of water from the pump / filter, the diameter of the waterpipe and the air inlet pipe will determine the amount of air drawn in which will reduce considerably as you lower the venturi outlet. I have venturi on some baby filters that will only fnction about half an inch below the surface, but on a 4000 lph power head you get about 5\" below the surface no problem. You will have to experiment.

The purpose of the venturi is to increase oxygen levels, mainly by greater surface movement of the water, so I am not sure why you would want to run it into the heater chanber at all, just water passing through there would be fine.

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19 Mar 2008 07:39 #3 by suckers (matt lait)
Replied by suckers (matt lait) on topic Re:venturi
the filter/heater are built into a background ( the diagram is looking at the back of the background)and i didnt want to add an airpump even tho i have a spare one.:P
i half also used the venturi in fry tank but as a waterfall effect by reducing the flow thru the outlet.in another tank i couldnt get it to work at 3in depth.:ohmy:

thanks for the reply
matt

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19 Mar 2008 12:07 #4 by Daragh_Owens (Daragh Owens)
Matt

As I said earlier the purpose of the venturi (or an airpump) is to increase oxygen levels, mainly by greater surface movement of the water, so with that set up there would be no benefit, even if you managed to get the venturi to work down as far as the heater. Just run the filter return past the heater, forget about venturi and if you need additional circulation you can install an airstone (from your airpump) in the tank later.

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19 Mar 2008 13:48 #5 by suckers (matt lait)
Replied by suckers (matt lait) on topic Re:venturi
OMG :S that means trying to drill a hole thru the background............ i think i might put one in now b4 its in place!!!!
thanks again .
matt

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