Results 21 to 40 of 44
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03-11-2020, 05:25 PM #21
Ok so the summer food is 48% protein.
On average I would feed between 200-230g per week (judged on weight of each handful).
The NO3 in tap is at 40ppm and current pond value is 10ppm.
But currently I feed winter food which is 20% protein and only about 20g every two days (as long as temperature is above 10C).
I have 25 large anoxic baskets running since March/April time.
Hopefully that helps?
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03-11-2020, 05:35 PM #22
Am I correct in my thinking that anoxic does not remove nitrate.
My understanding was It simply just removes the nitrogen cycle so ammonia is not converted but is neutralised and therefore no nitrate is added but if you are adding source water at 40ppm then this will not be removed by the anoxic
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03-11-2020, 05:39 PM #23
I have everything I need, except time , and I'll get back to you as soon as I finish the two urgent calculator bashing processes I'm already trying to do simultaneously.
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03-11-2020, 05:40 PM #24
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03-11-2020, 05:50 PM #25
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03-11-2020, 05:50 PM #26
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Frimley Koi keeper Thanked / Liked this Post
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04-11-2020, 07:48 PM #27
Sorry to have kept you waiting. I've given my calculator another hammering and these are the results:
The current feed rate (70 grams of 20% protein food per week) adds 0.7 mg/L nitrate to your pond per week.
The summer feed rate (200 - 230 grams of 48% protein) adds an average of 5.2 mg/L nitrate to your pond per week.
That's fairly typical and doesn't sound too bad but your trickle feed (0.2 L/min with 40 mg/L nitrate) also adds 40.32 mg/L to your pond per week. I.e. a total of approximately 41 mg/L in winter and 45 mg/L in summer.
If the anoxic system manages to reduce all that nitrate to 10 mg/L, I would say it's performing quite well.Last edited by Manky Sanke; 04-11-2020 at 07:56 PM.
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06-11-2020, 12:21 AM #28
Interesting post Syd, thank you for posting.
My nitrates have been elevated but as you know I still have a moving bed in addition to 23 anoxic baskets.
Using your calculations as a base, I am adding roughly 6.25 mg/l nitrates weekly, plus whatever my moving bed is adding on top.
Nitrates seem to have hit a ceiling at 40 mg/l and haven't increased despite minimal water changes and no trickle.
Could be an indication that I'm asking too much from Anoxic as opposed to my consideration that it was no longer performing properly.
200 grams of 51% protein food a day through summer is likely a key factor!
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06-11-2020, 12:23 AM #29
No need to apologize and thank you so much!
I really appreciate you spending time to work it out for me.
So am I understanding it right?
If anoxic is mature it can process both ammonia and nitrates (to some level).
But if there is no ammonia present for few weeks, will the anoxic continue to remove nitrates? Is there a time limit where ammonia must be re-introduced?
Also is the bigger the anoxic, the better it is at processing nitrates true? I thought my anoxic is an overkill for the small fish I have but it seems to work better than expected.
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06-11-2020, 10:25 AM #301000 gal
2 x Hozelock 6000ltr 9W UV
Allpond Spin Filter 8000 11W UV
Blagdon pond oxy 640 ltr/hr
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06-11-2020, 10:29 AM #311000 gal
2 x Hozelock 6000ltr 9W UV
Allpond Spin Filter 8000 11W UV
Blagdon pond oxy 640 ltr/hr
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06-11-2020, 10:32 AM #32
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06-11-2020, 11:32 AM #33
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06-11-2020, 11:34 AM #34
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06-11-2020, 11:36 AM #35
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06-11-2020, 12:08 PM #36
Yes, the moving bed is the problem. If all the ammonia from the fish went into the moving bed, it would make 10,200 mg of nitrate per day. If it all went into the anoxic filter, it would make 0 mg of nitrate. So, assuming the anoxic is getting half of of the ammonia that the fish produce, you are adding 5,100 mg of nitrate per day into the pond.
If the anoxic filter is reducing all that nitrate to just 40 mg/L without significant water changes then it's performing quite well.
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06-11-2020, 12:10 PM #37
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06-11-2020, 12:18 PM #38
In reality the anoxic filter will be getting less than half the ammonia available to process;
- Drum filtered water goes through the moving bed before it gets to the anoxic.
- The return from moving bed takes 50% of water through the anoxic (so as to slow water movement through anoxic pond) and 50% directly to the pond (12,000 lph total).
You may wonder why I've not gotten rid of the moving bed, and in fact I've added to it. This is because of ongoing low levels of ammonia (0.1 to 0.25) throughout the summer, probably linked to the high protein food. Thus I didn't have the confidence to switch off the moving bed.
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06-11-2020, 01:30 PM #39
If I'm reading this correctly which I'm probably not!!!
The anoxic filter is capable of removing Nitrates from a conventional filter system to a degree OK?
If that's the case then why not just build a bigger anoxic if running in on a pond that has a conventional filter system? Say 1.5 or 2 baskets for each fish? Obviously you need to have the space for the extra baskets?
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06-11-2020, 04:16 PM #40
It's all about space Frim, and the fact not many people build their pond with an Anoxic filter from the outset, it's usually something you discover later on and have to retrofit into available space.
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Running heater at low temp?
Covering the pond with polycarb should be enough to stop water temps dipping below 6C for the most...