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Bluechild Bluechild
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  • Posted on: 4/1/2013 15:47
Re: Help! My pond fish keep dying. #1
Thanks to everyone for all the info, things are starting to make (a little bit of) sense now! Ianbo, I couldn't find the filter on ebay, it might have sold by now, Wakefield isn't too far away so it would have been handy. I would appreciate some details about the Fishmate kit so I can weigh up all my options. Also, what do you know about the Yamitsu mega black box filters? Are they any good/suitable for my needs?
2010, from your comments I take it the ideal thing is to get a pump which has a max flow-rate a bit higher than my needs, but with the capability to be turned down? (I know you said that the Oase Aquamax, for example, are not adjustable).


Bluechild Bluechild
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  • Posted on: 31/12/2012 10:08
Re: Help! My pond fish keep dying. #2
Ah, thanks, Fishlady- another piece of the jigsaw!

Ianbo- it makes sense to choose a filter bigger than I think I will need (I did used to have some koi, and would like to again- once I know they aren't going to die!). But then, how does this affect the flow-rate of the pond system? I can't help feeling that this is something of an eternal circle where each element is dependent on the last, and so on.
It sounds like I need to sort my filter first and then work from there. I'm still woefully confused- does the flow-rate of the filter refer to the amount of water it can handle from the pump, before it floods? If that's correct, once the filter has been selected, I'm assuming any pump which has a max flow-rate slightly lower than that of the filter's max capacity would work? Thanks for your patience!


Bluechild Bluechild
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  • Posted on: 30/12/2012 23:05
Re: Help! My pond fish keep dying. #3
Thanks for the reply, 2010. You're right, of course, the once per hour does refer to koi ponds.
I don't think I made myself clear regarding the cm of fish thing- what does that in itself refer to? Is it total length of fish, amount of fish per litre? I'm afraid I haven't worked out the concept yet! Would you also be able to explain the meaning of filter capacity to me (at the beginning of my last post). Thanks.


Bluechild Bluechild
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  • Posted on: 30/12/2012 19:56
Re: Help! My pond fish keep dying. #4
As ever, thanks so much for the interest and advice. I'm afraid I'm still not quite "getting" the whole pond thing yet! Ianbo, when you say 'get a filter twice the capacity of your pond' what does "capacity" refer to? Is it the flow rate? ie do I need a filter with a flow rate of 4600 l/h (my pond volume being 2300l)?

The other thing is, I have had various advice about how many times per hour the volume of the pond should be circulated: 2010 has previously suggested that once every 2 hours is common, with the ideal being once every 4 hours, but others have suggested once per hour. What should I be aiming for with my set-up?

Also, what does the "cm" of fish refer to? Is it the amount of fish per certain amount of water or similar?
Sorry if I sound clueless!


Bluechild Bluechild
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  • Posted on: 28/12/2012 10:51
Re: Help! My pond fish keep dying. #5
I've been looking at the Oase Aquamax pumps and it seems that the 2000 would be the most likely candidate, although does the 3500 have an adjustable flow-rate so that I can reduce it? I can't find that information anywhere. The "head" for my pond set-up is one metre. The thing I'm struggling with is the filter, to pluck a couple of examples from the internet: the Hozelock Ecopower + 2500, does this pump water back up to the pond? Is the flow rate of the pump what governs the flow rate of the filter? Is it big enough form my pond? The description says it can handle ponds of 2500l with fish, but what amount of fish does this mean? I don't want to end up with my previous scenario where the equipment is working too fast for the health of the pond. I'd really appreciate some advice with all this because because every time I think I'm getting somewhere, I discover that there's something else I have to consider!


Bluechild Bluechild
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  • Posted on: 22/11/2012 19:53
Re: Help! My pond fish keep dying. #6
So despite my grand plans, Life has managed to keep me from sorting the pond! I have now emptied and cleaned it and removed the Neptun pump. Would someone be able to confirm if my earlier estimate was correct that I need a pump with a flow rate between 575 and 1150 l/h? I know that this forum's ethos is all about self-learning, but I would really appreciate some advice on a readily available example pump/filter combo that would suit my pond (I'm finding the filter the most mysterious part of all this!). Thanks all.


Bluechild Bluechild
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  • Posted on: 5/9/2012 13:41
Re: Help! My pond fish keep dying. #7
Hi, all,
Been doing loads of home improvements so I've been off the forum for a while. Now it's time to sort the pond. 2010, am I correct in thinking that I need a pump with a flow rate of between 575 and 1150 L/h? (I'm not sure what the lower rate of the Neptun is but I think you suggested that it would do for now if I turned it right down). And then I need a large box filter with plenty of media? Should that sort me out? Thanks for the help.


Bluechild Bluechild
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  • Posted on: 5/6/2012 22:47
Re: Help! My pond fish keep dying. #8
Wow, this isn't as straightforward as it seems! I'm assuming the filters have a broad range of what they can cope with to allow for fish growth and new stock etc? And is bigger better as far as a box filter goes to let the water sit in the medium, or is it a delicate balance?


Bluechild Bluechild
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  • Posted on: 5/6/2012 19:18
Re: Help! My pond fish keep dying. #9
And what amount of fish will be ok in there once I get it sorted? Thanks.


Bluechild Bluechild
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  • Posted on: 5/6/2012 13:27
Re: Help! My pond fish keep dying. #10
So, with a pump-fed filter, the flow rate of the pump is the only relevant figure? How do you decide what size filter is required once the correct pump has been selected?



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