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Introduction of BjornD

PostPosted: Tue 02 Feb 2016, 8:34:35
by bjornd
Hi, my name is Bjorn, 40 years old working as an Systems Administrator and just like most of you i’m a koi enthusiast.
I’ll live in Heerlen, the netherlands. I’m one of the many volunteers during the holland Koi show in Arcen.
One of my hobby's is keeping koi of course, but i'm member of a club which trains K9 as police dogs.

I started with koi about 13 years ago, in a very small pond (2500 Liters), after i moved, i created a bigger rectangular pond which contained 24000 Liters of water. This pond was filtered by a small but very efficient DIY 3-chamber filter (Static Bed / Moving Bed / Japanese Matting).







My old filtration 3*330Liter Polyester containers (Static Bed / Moving Bed / Japanese Matting).

After a year i decided to create a small plant filter, after the build my pond contained 30000 Liter.



a year later the pond was expanded again to its later size. at that point i changed the system, in a way so that airlift could be used.

A see through to the 2nd upgrade

2 years ago i decided to create a 2nd filterunit. This filterunis is being build in concrete and a Polyester finish.



the Collector which houses the airlift

A working Crielsieve.


My pond consists of 40000 Liter of water, and will be kept clean by (when i’ve done) 2 filters.
3 bottom drains, 1 skimmer, very small plant filter
1st filter: 2 chambers
• Criel sieve
• Moving Bed
• Airlift
2nd filter: 3 chambers
• Criel sieve
• Moving Bed
• Japanese Matting
• Airlift

My pond runs on 2 airlifts and comsumes only 100 watt in total.
At the moment i’ll have 12 koi swimming around

Re: Introduction of BjornD

PostPosted: Mon 11 Apr 2016, 12:10:29
by spirulina
Thank you Bjorn for sharing all this with us. The growth in size of your Koi ponds is impressive.

I had two questionsl

1. Would you please share with us how you fashioned your air injection at the bottom of your air-lifts.

2. Would you be familiar with Seacalcs app for designing air-lifts: ...



Re: Introduction of BjornD

PostPosted: Mon 02 May 2016, 11:28:16
by bjornd
Hi Spirulina,

Sorry that my reaction took a while, but my work took a lot of time.

my air injection of most airlifts i build is a 20mm PVC tube, when i use heavier pumps (> 60 Liter/min), then the size will increase to 25mm with a max. of 32mm.

I saw the app, but need to install it, i never used it before.
I hope it knows the metric system as well

Re: Introduction of BjornD

PostPosted: Mon 02 May 2016, 21:36:42
by bjornd
I've played a little with the app.
what i found strange, is the size of the airholes and the number of them.

the app needs more variables, e.g. hole diameter
but this is a start, i try to contact the developer.

Re: Introduction of BjornD

PostPosted: Mon 09 May 2016, 7:18:33
by bjornd
I,ve contacted the developer, his reaction about my questions are.

They use the air to decrease the size of the debris. so the amount of holes and the size of it, are not important for his line of duty.
but a very important thing, following his idea is the fact to drill the holes in a 45 degree angle.
PVC is a soft material, but the drills in our used size are very brittle. but nevertheless when i've got time, i'm gonna test.



Re: Introduction of BjornD

PostPosted: Tue 10 May 2016, 13:20:32
by Frank
45 degree ist exciting...


Re: Introduction of BjornD

PostPosted: Sun 22 May 2016, 11:02:39
by bjornd
I updated my first post with some pictures of my pond and filtration.

This is not how it looks like now, because it's a work in process at the moment.