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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

what does pump height mean?

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03 Apr 2015 22:07 #1 by LemonJelly (Johnny Cowley)
On aquarium pumps it always mentions pump height and there's usually a graph showing how flow rates tail off the higher the water is pumped. What I want to know is, is does the pump height refer to the height the water is pumped above water level or to the height it's pumped above the pump itself?

"The only thing that burns in Hell is the part of you that won't let go of your life; your memories, your attachments. They burn them all away. But they're not punishing you.They're freeing your soul."

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03 Apr 2015 22:12 #2 by hammie (Neil Hammerton)
As far as I can work out, it's height above pump level not the water level

So if the tank is 1 meter high and the stand is 1.5meters high(pump level 0.3m from top to bottom) then pumping level would be 2.2meters

Thats how I understand it anyway

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03 Apr 2015 22:17 #3 by carlowchris (chris)
As far as I understood it ..it was from the pump .

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03 Apr 2015 22:40 #4 by LemonJelly (Johnny Cowley)
That was my understanding too. I just didn't realise the flow bleeds off so quickly once it leaves the pump. I have an eheim compact 600. It's max flow rate is listed as 600lph and the pump height is 1.3m. According to the graph if I place it in my tank to feed an overhead sump sitting on the hood, by the time the pump outflow has been only reached the surface it's already lost almost half of its power!

"The only thing that burns in Hell is the part of you that won't let go of your life; your memories, your attachments. They burn them all away. But they're not punishing you.They're freeing your soul."

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03 Apr 2015 23:18 #5 by Miamiheat (Stephane Lemaire)
yes it's called the HEAD.
its the maximum height the pump can push water vertically.

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04 Apr 2015 00:11 #6 by JustinK (Justin Kelly)

yes it's called the HEAD.
its the maximum height the pump can push water vertically.


+1
Head height.
The weight of the water pushing back down on the pump cancels out the force of the water being pushed out by the pump.
To calculate your position on the graph just measure up from your pump to the highest point the water has to travel to reach the destination. Every meter is 0.1bar approx, bends and other friction causing surfaces decrease the pressure or head height obtainable by the pump.

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