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  1. #21
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    Quote Originally Posted by dbs View Post
    Thank you, I was hoping to 'get away' with a 10,000 for the skimmer just to keep the elec bill down when possible but if it needs bigger then so be it, that purchase is a few weeks off yet

    I would love to keep the Nexus but I think/hope a sieve will be better, I will not have the room for Dracko Combi, a nexus and a sieve as my kit/shed is going to only be circa 1m depth with a low roof tucked behind my long pond (currently planned at 6.5w x 2.5d x 1.6h - although these internal dimensions may change slightly)
    You might still be able to use a 10000 lph pump on your Nexus as I read on here recently that 6000 to 7000 lph is a good flow rate for them so even allowing for flow and pressure losses that might be about right for a 10000 lph pum without stressing it too much long term?

    Sorry I hope I'm not repeating myself here but it's been a hot and very dusty morning here

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  3. #22
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    Quote Originally Posted by freddyboy View Post
    Frims right a sieve is only mechanical you need bio after the sieve.
    A sieve is a pre cleaner. Before going into let's say a nexus or bakki shower.

    On my setup I have 2 lines seperate.

    1st line bottom drain to drop in draco. Nexus 320 30000lph pump then 55 watt UV
    Then bakki shower. Top pond with plants. That's all my bio.

    2nd line skimmer to ultra sieve 3 to 15000lph pump to 55watt UV. To 2x mid returns . That's all mechanical.
    Hope that helps.
    Fred

    Sent from my SM-G960F using Tapatalk
    That's interesting Fred that you don't have bio on your skimmer.

    Is that the general idea or just what works for you as I can see the theory behind not needing bio on your line as your main system deals with that side of things

    I just did a "I've got it going spate so I'll use it" skimmer line and it's a bit of an odd set up I guess.

    Skimmer gravity feeds a 3500 lph fixed speed pump - so that's gone from gravity to pumped straight away lol

    From the pump to a Bioforce Revolution 6000 filter with built in UVC not that it's plugged in. So that's staying with pumped.

    From the Bioforce filter to an Oase Y with valves on. One branch then feeds a Tornado 2 protein skimmer and the other just goes back into the pond so I can bypass the protein skimmer when required.

    So I have a mixture of mechanical plus a tiny bit of bio filtration on that system. Odd set up but it works OK for now

  4. #23
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    Quote Originally Posted by dbs View Post
    Ahhh yes, no problem I know the cubic capacity, what my brain was trying to work out was the following...

    If my main pump dialled down is circulating the main body of water say 13,000 per hour so turns over the whole pond in 2 hours, what does the skimmer need to do... in that, 2 scenario's, if the pond was 10 x 2 x 1.6 deep there would be 20m2 of surface water to skim, yet the same volume of water if the pond was deeper would have a smaller surface area to 'skim off' eg a pond 6.4 x 2 x 2.5 deep would only have the surface area of 12.8m2.

    Hmmmm hoping I have explained that correctly
    OK I understand what you mean now sorry I thought you were saying total pond turn over only.

    Yes if I understand it correctly a wall mounted skimmer is only going to be filtering the surface if it's all moving nicely and you have no dead spots and then maybe only goes to a few inches below the surface, again depending on how much movement you have in the water. So I would think that if you say your skimmer mouth sits down below the surface of the wayer by say 4" then to work out the volume the skimmer is going to have to handle or filter I would say add another 2 to 4 inches below that then multiply your surface area by the distance down from the surface to 2 to 4 inches below the bottom of the mouth of the skimmer. Then using the volume figure from that and the maximum flow rate you want your filter to be working at you should be able to spec a pump.

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  6. #24
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    Ah yes the EA variable speed pump

    I've not seen the full spec on those but remember reading something on here that said they can be controlled from 0% right through to 100% if that's correct then it's probably a good option. You just need to check that there isn't a minimum speed it will start at?

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  8. #25
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    Quote Originally Posted by Frimley Koi keeper View Post
    You might still be able to use a 10000 lph pump on your Nexus as I read on here recently that 6000 to 7000 lph is a good flow rate for them so even allowing for flow and pressure losses that might be about right for a 10000 lph pum without stressing it too much long term?

    Sorry I hope I'm not repeating myself here but it's been a hot and very dusty morning here
    No worries, without the full picture any parameter can change... I presume the Nexus will do fine on the skimmer as the skimmer will have a basket to catch the biggest bits out, though again I would prefer a smaller footprint as the nexus is 1200'ish and a nice sieve could be as small as 370mm (if the Drum/Bio) is okay doing all the bio

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  10. #26
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    Quote Originally Posted by dbs View Post
    No worries, without the full picture any parameter can change... I presume the Nexus will do fine on the skimmer as the skimmer will have a basket to catch the biggest bits out, though again I would prefer a smaller footprint as the nexus is 1200'ish and a nice sieve could be as small as 370mm (if the Drum/Bio) is okay doing all the bio
    You can never have enough bio so if I could fit one in my filter shed I'd be swapping my Eazy Pod for a Nexus 220 but it won't even go through the bloody shed door

    If the drum and bio chamber can handle the entire pond with room to spare then maybe loose the Nexus and just go skimmer, sieve, pump and return to pond.

    As long as you have the basics and they can handle the growth of the fish or additional fish then your on the right track I would like to think

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  12. #27
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    Quote Originally Posted by Frimley Koi keeper View Post
    That's interesting Fred that you don't have bio on your skimmer.

    Is that the general idea or just what works for you as I can see the theory behind not needing bio on your line as your main system deals with that side of things

    I just did a "I've got it going spate so I'll use it" skimmer line and it's a bit of an odd set up I guess.

    Skimmer gravity feeds a 3500 lph fixed speed pump - so that's gone from gravity to pumped straight away lol

    From the pump to a Bioforce Revolution 6000 filter with built in UVC not that it's plugged in. So that's staying with pumped.

    From the Bioforce filter to an Oase Y with valves on. One branch then feeds a Tornado 2 protein skimmer and the other just goes back into the pond so I can bypass the protein skimmer when required.

    So I have a mixture of mechanical plus a tiny bit of bio filtration on that system. Odd set up but it works OK for now
    i have it that way as there is more then enough on the line 1 lol 320 liters of k1 and helx mixed in, i have had 61 fish in there for 4 1\2 years with no problems as in water parameters. and feed heavy. plus i have a bakki shower now as well and that got added this spring.
    my problems been parasites. the 2nd line with ultra sieve 3 . i have no room in the filter house for to add bio after the sieve. so that is there for circulation of the pond. but it don t half take some crap out lol
    there good are thee old ultra sieve 3 lol
    fred

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  14. #28
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    Quote Originally Posted by Frimley Koi keeper View Post
    Ah yes the EA variable speed pump

    I've not seen the full spec on those but remember reading something on here that said they can be controlled from 0% right through to 100% if that's correct then it's probably a good option. You just need to check that there isn't a minimum speed it will start at?
    I have a Varipump 20,000. It supports OFF, 1% through to 100% in 1% increments. It remembers the last % setting on power failure.. so when it starts up again it runs at the same % and not OFF or 100% (tested that ).

    I would make a point on head height - if you need to pump into 2 meters of head pressure (pipe constriction or height) then you may find that the pump will not pump water at 10% for example.

    On my little pond, as a temp setup the pump is running at 30% (40W).. during the winter on the large pond it will probably run at the same rate.. summer uses the airlifts and the pond is set to OFF.
    14000l, my mutts: Chargoi (2010), Doitsu (2022), Tancho (2022), Kujaku (2022), Hi Utusri (2022)

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  16. #29
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    Quote Originally Posted by freddyboy View Post
    i have it that way as there is more then enough on the line 1 lol 320 liters of k1 and helx mixed in, i have had 61 fish in there for 4 1\2 years with no problems as in water parameters. and feed heavy. plus i have a bakki shower now as well and that got added this spring.
    my problems been parasites. the 2nd line with ultra sieve 3 . i have no room in the filter house for to add bio after the sieve. so that is there for circulation of the pond. but it don t half take some crap out lol
    there good are thee old ultra sieve 3 lol
    fred
    Yes I thought you would have enough bio on your main system Fred

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  18. #30
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    Quote Originally Posted by NickK-UK View Post
    I have a Varipump 20,000. It supports OFF, 1% through to 100% in 1% increments. It remembers the last % setting on power failure.. so when it starts up again it runs at the same % and not OFF or 100% (tested that ).

    I would make a point on head height - if you need to pump into 2 meters of head pressure (pipe constriction or height) then you may find that the pump will not pump water at 10% for example.

    On my little pond, as a temp setup the pump is running at 30% (40W).. during the winter on the large pond it will probably run at the same rate.. summer uses the airlifts and the pond is set to OFF.
    That's good to know Nick, thanks

    So basically it will start from 1% upwards as long as the head of water is lower than 2m but if above 2m then you need to get to 30% to make it start every time

    Considering they are from EA they are not bad money and very controllable. That sounds like a win, win situation to me

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  20. #31
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    Sorry 30% may not be right ?

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  22. #32
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    Quote Originally Posted by Frimley Koi keeper View Post
    That's good to know Nick, thanks

    So basically it will start from 1% upwards as long as the head of water is lower than 2m but if above 2m then you need to get to 30% to make it start every time

    Considering they are from EA they are not bad money and very controllable. That sounds like a win, win situation to me

    Wait.. that 2m was an example. It's just I noted if I go too low it struggles to pump if there's too much head pressure. My point being the more head pressure the more % is required to make the flow rate.. and if you don't overcome the head pressure.. you'll get no flow rate
    14000l, my mutts: Chargoi (2010), Doitsu (2022), Tancho (2022), Kujaku (2022), Hi Utusri (2022)

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  24. #33
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    Yes I totally understand that Nick but at least it's a good starting point as I think I have about 2m head allowing for lift and other flow restrictions between my pump and the Eazy Pod and a flow rate of 6000 lph is a good flow rate for it to have enough dwell time in the K1

    I'm looking to get a new pump and was looking at the EA variable versions and was stuck between the 10000 and 20000 lph versions.

    With my setup running a 20000 lph pump I would try 30% and if required go to 35 or 40%

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  26. #34
    Senior Member Rank = Mature Champion dbs's Avatar
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    Quote Originally Posted by Frimley Koi keeper View Post
    OK I understand what you mean now sorry I thought you were saying total pond turn over only.

    Yes if I understand it correctly a wall mounted skimmer is only going to be filtering the surface if it's all moving nicely and you have no dead spots and then maybe only goes to a few inches below the surface, again depending on how much movement you have in the water. So I would think that if you say your skimmer mouth sits down below the surface of the wayer by say 4" then to work out the volume the skimmer is going to have to handle or filter I would say add another 2 to 4 inches below that then multiply your surface area by the distance down from the surface to 2 to 4 inches below the bottom of the mouth of the skimmer. Then using the volume figure from that and the maximum flow rate you want your filter to be working at you should be able to spec a pump.
    Ahhh thanks goodness, yes spot on Frimley, my typing often does not explain how my mind is thinking

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  28. #35
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    Quote Originally Posted by dbs View Post
    Ahhh thanks goodness, yes spot on Frimley, my typing often does not explain how my mind is thinking
    Join the club lol

    I find using the phone to reply is a pain sometimes compared to the laptop as that's easier to spell check on and doesn't use predictive text either lol

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  30. #36
    Senior Member Rank = Mature Champion dbs's Avatar
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    Quote Originally Posted by Frimley Koi keeper View Post
    You can never have enough bio so if I could fit one in my filter shed I'd be swapping my Eazy Pod for a Nexus 220 but it won't even go through the bloody shed door

    If the drum and bio chamber can handle the entire pond with room to spare then maybe loose the Nexus and just go skimmer, sieve, pump and return to pond.

    As long as you have the basics and they can handle the growth of the fish or additional fish then your on the right track I would like to think
    Thank you again... Hopefully yes basics are good and future expansion is allowed for in sizing of the Drum/Bio

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  32. #37
    Senior Member Rank = Mature Champion dbs's Avatar
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    Quote Originally Posted by Frimley Koi keeper View Post
    Ah yes the EA variable speed pump

    I've not seen the full spec on those but remember reading something on here that said they can be controlled from 0% right through to 100% if that's correct then it's probably a good option. You just need to check that there isn't a minimum speed it will start at?
    Will do, Yes i am hoping it does so yes I will check tonight after my tea, I may if it requires a 200000 for the skimmer, instaed of getting another 20000 but use the one ordered already and increase the main to a 30000 to again futureproof... then hide another receipt to the 'pond refresh' costs

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  34. #38
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    Quote Originally Posted by NickK-UK View Post
    I have a Varipump 20,000. It supports OFF, 1% through to 100% in 1% increments. It remembers the last % setting on power failure.. so when it starts up again it runs at the same % and not OFF or 100% (tested that ).

    I would make a point on head height - if you need to pump into 2 meters of head pressure (pipe constriction or height) then you may find that the pump will not pump water at 10% for example.

    On my little pond, as a temp setup the pump is running at 30% (40W).. during the winter on the large pond it will probably run at the same rate.. summer uses the airlifts and the pond is set to OFF.
    Thanks Nick, saves me looking it up.

    I do have another option for kit storage and that is putting in another shed further down the garden, but that would require circa 20m of above ground pipework, , your runs are long if I recall correctly but are all below ground ??

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  36. #39
    Senior Member Rank = Mature Champion dbs's Avatar
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    Quote Originally Posted by Frimley Koi keeper View Post
    Join the club lol

    I find using the phone to reply is a pain sometimes compared to the laptop as that's easier to spell check on and doesn't use predictive text either lol
    Haha yes me too... online chat is way better for me multi-tasking with suppliers, and yes spell check and double checking what the hell I am trying to explain... must be an age thing

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  38. #40
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    Quote Originally Posted by dbs View Post
    Thanks Nick, saves me looking it up.

    I do have another option for kit storage and that is putting in another shed further down the garden, but that would require circa 20m of above ground pipework, , your runs are long if I recall correctly but are all below ground ??
    You could work out the pressure using a head height calculator - including the pipe dimensions and the bends etc: https://www.plasticpipeshop.co.uk/Fl...r_ep_60-1.html for example.

    My planned runs will be underground - on the plan about 6 meters using swept 90 bends (30cm radius).

    20m could work, you may need larger pipes to reduce back pressure.
    14000l, my mutts: Chargoi (2010), Doitsu (2022), Tancho (2022), Kujaku (2022), Hi Utusri (2022)

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