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Bluechild Bluechild
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  • Posted on: 31/5/2012 18:53
Re: Help! My pond fish keep dying. #11
OK, actual internal pond measurements are L 94in/239cm, W 45in/114cm, D 33in/84cm. This gives a volume of 2288.664L, so let's say 2300L for the sake of argument. From what 2010 is saying I guess I need a pump with a max flow rate of between 575l/h (9.5l/min) and 1150l/h (19l/min) but preferably nearer the lower figure? I'm assuming the flow rate of the filter should be similar. Am I right in thinking that box filters are gravity-fed? because this would present a problem as my pond is a raised one. My only other questions are- should I clean my pond out before I replace the kit, or allow the new kit to clean it over time before stocking? And what amount of fish will a pond of this size sustain? Thanks again for all the advice, the knowledge levels on this forum are very impressive!


Bluechild Bluechild
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  • Posted on: 30/5/2012 9:30
Re: Help! My pond fish keep dying. #12
Thanks for the interest.

MyLittleAquarium- no, the sleepers are untreated, they were new and not reclaimed so should not have any harmful products within them.

2010- the max flow rate of the pump is stated as 83 l/min (which sounded like a lot to me!). The volume of my pond is approx 507 gallons (2304 litres) using the exact internal measurements. The filter has a max flow rate of 7500 l/h (125 l/min). I'm not sure where you're leading me here. Is the equipment mis-matched? I went to an aquatic centre with my pond dimensions and this is the stuff they reccomended. Again, thanks for your help.


Bluechild Bluechild
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  • Posted on: 29/5/2012 13:29
Help! My pond fish keep dying. #13
Dear all, please can someone help- I have an 8ft by 3ft railway sleeper pond which is lined and is 3ft deep. It has an OASE NEPTUN 5000 85w pump, a FISHMATE 15000 UV+bio pressurised filter, and an OASE AQUA-OXY 400 air bubbler. I also have 2 floating pot-plants. However, over the 2yrs the pond has been in use, all the fish have died, most with no obvious signs of problems. I had goldfish, koi, shibunkin, orfe, tench, grass carp, and ghost carp. These fish all lived happily in a much smaller pond I had dug in the ground at my old house with much less powerful equipment. They also survived for several months in a large paddling pool while I built the existing pond! I had the water tested a while ago and was told it was high in nitrates, so I reduced feeding and introduced the plants and carried out regular water changes. None of this helped. The pond is now empty and has developed a large stock of weed. Any ideas why I can't maintain a viable eco-system? I love having fish, but I'm considering turning my pond into a veg patch if I can't keep them alive! All advice welcome. Thanks.



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