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  1. #1

    Question new pond build- Filter? Fibreglassing

    Hi,
    i've just joined the forum because i am planning a 4,200 gallon koi pond,
    what would most people recommend filter wise, best value for money and future proof?

    also has anyone done fibreglassing themselves? all the videos and tuition pages shows its quite straight forward, but many advise leaving it to professionals.

    any help advice much appreciated
    Thanks



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  3. #2
    Senior Member Rank = Nanasai samp09's Avatar
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    hello Guitar bomber, you will find a wealth of knowledge if you use the search button on both subjects. Budget will greatly affect answers so more information will be needed really. what have you planned so far

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  5. #3
    Hi Samp09,
    My pond is in the exercise book stage at the moment,
    3.8 x 3.3 x 1.5m(min)

    i'm leaning towards sleepers 900mm above ground at least 600mm below,

    1 bottom drain,
    1 skimmer,
    2 inputs,

    i've got my eye on the Filtreau combi 20 with jap matting, although my choices change almost daily.

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  7. #4
    Senior Member Rank = Hassai Koiz's Avatar
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    My wish list for any new pond, based on experience from an, at times, painfully steep learning curve, would include:

    At least one window.

    Bottom drain, Gravity fed drum filter with moving bio and /or separate area for Anoxic filtration (prob two layer pond with waterfall from Anoxic, with planting, into main pond).

    By pass on drum, or removable screens (eg Oase proficlear range), for using powdered treatments.

    Easily accessible UVC on clean water return so bulb changing isn't a nightmare.

    Two underwater returns - one high, one low to ensure good circulation and bottom clearance with valve controlled flow.

    Good slope to bottom drain to prevent dead spots.

    Dimensions and shape of pond that will allow easy covering with poly carbs in winter and framed nets in summer to protect against heron and leaf fall.


    Shamferred corners (insulation under fibreglass). Would strongly advise to use a professional - its a messy, skilled and smelly job! Plus a good fibreglasser will guarantee their work.

    Skimmer to water blade for surface cleaning, operated by separate pump to main filter as provides backup in event main pump fails.

    Vario speed pumps (Aqua Forte - great, affordable pumps).

    Two air pumps - one for media, one for airstones in pond. Again adds backup if one fails as moving media requires air at all times.

    Plenty of ball and side valves, and EA Eazy Connectors to make dismantling, cleaning and maintenance easy.

    A good microscope - you WILL need one! Apex Practitioner or Researcher from Brunel Microscopes.

    Pipe runs as short as possible and easy to insulate for winter.

    Easy to insulate filtration setup with space for expansion or extra apparatus if hobby takes hold (eg heating), protected under cover on all sides.

    Indoor area and budget for home quarantine set up for new and poorly fish.

    Decent water testing drop kit or, if money allows, digital.

    Buy fish from only recommended retailers on this forum!

    Finally, if you enjoy tinkering on your PC, I highly recommend creating a 2D/3D plan for your build using the free Sweethome 3D software. If this appeals, let me know and I'll share a bit more info on how I've used it.

    Hope you find something in all this that provides food for thought new pond build- Filter? Fibreglassing

    Sent from my SM-N910F using Tapatalk
    11,440L Raised Pond, BD, Oase ProfiClear, Bitron 55W, 2x10k Aquaforte Varios, Skimmer to Waterblade

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  9. #5
    Senior Member Rank = Rokusai Mike Bass's Avatar
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    Quote Originally Posted by Koiz View Post
    My wish list for any new pond, based on experience from an, at times, painfully steep learning curve, would include:

    At least one window.

    Bottom drain, Gravity fed drum filter with moving bio and /or separate area for Anoxic filtration (prob two layer pond with waterfall from Anoxic, with planting, into main pond).

    By pass on drum, or removable screens (eg Oase proficlear range), for using powdered treatments.

    Easily accessible UVC on clean water return so bulb changing isn't a nightmare.

    Two underwater returns - one high, one low to ensure good circulation and bottom clearance with valve controlled flow.

    Good slope to bottom drain to prevent dead spots.

    Dimensions and shape of pond that will allow easy covering with poly carbs in winter and framed nets in summer to protect against heron and leaf fall.


    Shamferred corners (insulation under fibreglass). Would strongly advise to use a professional - its a messy, skilled and smelly job! Plus a good fibreglasser will guarantee their work.

    Skimmer to water blade for surface cleaning, operated by separate pump to main filter as provides backup in event main pump fails.

    Vario speed pumps (Aqua Forte - great, affordable pumps).

    Two air pumps - one for media, one for airstones in pond. Again adds backup if one fails as moving media requires air at all times.

    Plenty of ball and side valves, and EA Eazy Connectors to make dismantling, cleaning and maintenance easy.

    A good microscope - you WILL need one! Apex Practitioner or Researcher from Brunel Microscopes.

    Pipe runs as short as possible and easy to insulate for winter.

    Easy to insulate filtration setup with space for expansion or extra apparatus if hobby takes hold (eg heating), protected under cover on all sides.

    Indoor area and budget for home quarantine set up for new and poorly fish.

    Decent water testing drop kit or, if money allows, digital.

    Buy fish from only recommended retailers on this forum!

    Finally, if you enjoy tinkering on your PC, I highly recommend creating a 2D/3D plan for your build using the free Sweethome 3D software. If this appeals, let me know and I'll share a bit more info on how I've used it.

    Hope you find something in all this that provides food for thought new pond build- Filter? Fibreglassing

    Sent from my SM-N910F using Tapatalk
    wow I managed to tick all the boxes apart from the CAD design & the Toblerone corners....I just planned in my head
    1kGal BD/Skim Drum/chamber/brush/mat/UV/k1 3.2kGal 2window 2airBD/skim Sieve/Drum&k1 alfa/anox/UV

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  11. #6
    Moderator Rank = Supreme Champion Feline's Avatar
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    I’m all for having a plan (in my head mostly) then letting it evolve over time

    I think that everybody’s needs and ideas are a bit different, so there is no recipe that fits all, other than bottom drain and skimmer- a new build koi pond must have these.
    You also must have an overflow (which can be in the skimmer).

    Ideally your filter house or enclosure should have electricity, water supply, and connection to main drainage. (Mine also has Ethernet ).

    The volume you are planning sounds good. Don’t go too deep- 6 foot max, 5 foot better, it’s better to gain extra volume by going wider or longer than it is deeper. This is due to surface gas exchange reasons as well as swim bladder disease.

    If you get the pipe work to the pond and the valves right, filter choices are changeable and upgradable in the future. I would advise you not to get a Nexus though personally (it won’t give you enough flow on that volume and the mechanical filtration is not the best).

    I usually recommend people try to visit as many local enthusiasts ponds as possible to see what they like and what they don’t, but that’s going to be more tricky with Covid restrictions etc. Have a read through the pond build section on here- it will help you with ideas and hopefully help you dodge some of the mistakes that others have made!

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  13. #7
    Senior Member Rank = Hassai Koiz's Avatar
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    Quote Originally Posted by Mike Bass View Post
    wow I managed to tick all the boxes apart from the CAD design & the Toblerone corners....I just planned in my head
    My head doesn't work as good as it used to ... hence CAD plans. They also feed my OCD beast nicely new pond build- Filter? Fibreglassing new pond build- Filter? Fibreglassing new pond build- Filter? Fibreglassing

    Sent from my SM-N910F using Tapatalk
    Last edited by Koiz; 27-09-2020 at 01:31 PM.
    11,440L Raised Pond, BD, Oase ProfiClear, Bitron 55W, 2x10k Aquaforte Varios, Skimmer to Waterblade

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  15. #8
    Senior Member Rank = Hassai Koiz's Avatar
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    Oooh yes ... Feline reminded me of a biggie I've missed off my list - drum waste plumbed into main drain. What wouldn't I give to not have to deal with a dewatering bag and a soakaway !!! new pond build- Filter? Fibreglassing

    Sent from my SM-N910F using Tapatalk
    11,440L Raised Pond, BD, Oase ProfiClear, Bitron 55W, 2x10k Aquaforte Varios, Skimmer to Waterblade

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  17. #9
    Thanks for the reply, i love the thought of an Anoxic layer falling into the pond

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  19. #10
    Senior Member Rank = Hassai Koiz's Avatar
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    Quote Originally Posted by guitarbomber View Post
    Thanks for the reply, i love the thought of an Anoxic layer falling into the pond
    Me too. Wish I had one new pond build- Filter? Fibreglassing. I've had to settle for Anoxic baskets sitting on the shelf in my pond but I didn't know about Anoxic in 2017 when I had my pond rebuilt!

    Sent from my SM-N910F using Tapatalk
    11,440L Raised Pond, BD, Oase ProfiClear, Bitron 55W, 2x10k Aquaforte Varios, Skimmer to Waterblade

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  21. #11
    Senior Member Rank = Rokusai Mike Bass's Avatar
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    Quote Originally Posted by Koiz View Post
    Oooh yes ... Feline reminded me of a biggie I've missed off my list - drum waste plumbed into main drain. What wouldn't I give to not have to deal with a dewatering bag and a soakaway !!! new pond build- Filter? Fibreglassing

    Sent from my SM-N910F using Tapatalk
    I know I am having to dig from the small pond to the large pond to the inspection pit to lay the waste pipe
    1kGal BD/Skim Drum/chamber/brush/mat/UV/k1 3.2kGal 2window 2airBD/skim Sieve/Drum&k1 alfa/anox/UV

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    Senior Member Rank = Rokusai Twhitenosugar's Avatar
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    One thing you might want to consider is using an airlift to pump your water round. I use one on my pond and it's way more economical to run than a conventional water pump.

    If you are not sure what one is, search on this forum. I've posted how I built mine, but other useful threads are about too.

    If you go down this route I'd still recommend installing a 2" return in the pond wall as well as the 4" return, so you have a back up.

    Good luck with the planning stage. I loved designing mine.


    Sent from my SM-A520F using Tapatalk
    Last edited by Twhitenosugar; 28-09-2020 at 10:13 AM.
    12,500L fibreglassed raised pond with window

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  25. #13
    Extreme Koi Member Rank = Hassai NickK-UK's Avatar
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    Quote Originally Posted by guitarbomber View Post
    Hi,
    i've just joined the forum because i am planning a 4,200 gallon koi pond,
    what would most people recommend filter wise, best value for money and future proof?

    also has anyone done fibreglassing themselves? all the videos and tuition pages shows its quite straight forward, but many advise leaving it to professionals.

    any help advice much appreciated
    Thanks

    So 4400 gallons is 20,000 litres. I would recommend running 2x the capacity in lph. So for 20,000l pond, a 40,000lph drum minimum from experience.

    The biggest impact I've seen on the pond is going with a drum. Physically it removes so much mess out of the pond it's bananas! However it's not the only thing required.

    Think of the pond as a bio reactor - so think how much waste you will have to process and remember the drum only removes physical waste, you will need something to process the biological side (nitrogen cycle).

    My pond 2.0 is designed 13,000 litres, split 11700 pond and 1300l anoxic chamber. Unfortunately biological processing takes space - or - a large water bill trickling changing the water. When you plan - think about the addition of slab and sub-base depth if you go underground. Pond 2.0 is currently 1.5m below ground level.. and the cost of soil removal is high given the cost of access logistics. However once complete it will run on ~57W using airlifts (for about 30-36,000lph) rather than relying on pumps (at least 190W for 20,000lph).

    So you will need to solve those two things (mechanical and bio filtration).
    1700 litres on 50 watts
    Planned 11,777 litres on 58 watts. 1300l anoxic, 4" airlifts, Solum 16, bio.

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  27. #14
    Quote Originally Posted by guitarbomber View Post
    Hi,
    i've just joined the forum because i am planning a 4,200 gallon koi pond,
    what would most people recommend filter wise, best value for money and future proof?

    also has anyone done fibreglassing themselves? all the videos and tuition pages shows its quite straight forward, but many advise leaving it to professionals.

    any help advice much appreciated
    Thanks
    Iv got a sleeper pond but I reckon if I went that size Id do block. Have a little look into block ponds to be sure sleeper is what you want. All the best


    Sent from my iPhone using Tapatalk

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