Hello Dave's what a excellent job you done on your moving bed filter mate , I will make one later next year once I finish my upgrades on my pond, so I hope I can pick your brain some time for your help and advice. 👍👍👍
Looks great Dave. Look forward to seeing in place & working. Well done mate, watched series from start to finish. Will start having a go soon over the winter months, ready for the Spring.👍
Thanks, 🙂 I'd say it's not for the faint hearted, but it's not rocket science either... The biggest tip would be to do lots of practise pieces with scrap sheet, and make some smaller items to start with. I made my current smaller polypropylene bio tank, and a 4" PVC skimmer I made for my current pond build...👍
Thanks, 👍 I'm trying to remember now... The plastic sheet and 40 x 40 square tube was about £300 delivered but the welding rod and welder I had from my previous bio build. plus a few bits and bobs for the air line. at about £20... Welding isn't difficult if you are capable at wood work, and can build things from scratch. But you do need to practise on scrap pieces if you've never done it before. I made my pond skimmer in welded PVC sheet, then a flange for my pond window in PVC sheet, before making the first bio tank. So I have had a bit of practise...
I've not done any HDPE welding, but seen youtube videos of RV water tanks being made, and they look pretty tough.🙂 Maybe it depends on the thickness of sheets that is welded? ruclips.net/video/ddLlSRtYqFU/видео.htmlsi=5TnAp_tJynvdpNMm I've done PVC welding before and that was a real pain, as even slightly too much heat and it scorches black really easy.
Thanks 👍 Some of the stuff I already had, the heat welder and welding rod. but the 12mm plastic and box section came to £293 inc delivery, the 9mm for the lid was a piece I had left over from a couple of years ago. The cutting list and supplier I used are also in the descriptions of the part 1 and 2 videos. www.oadbyplastics.co.uk/
Yes mate no problem, It's also the first link in the description 🙂 postimg.cc/hXqCfRC6 It doesn't have every single one of the smaller pieces or the lid, some of the smaller ones I cut myself, as I needed to build, and then measure exact sizes. BTW this is still a prototype, it's not been tested in situ and found working yet 😄
@@martinokeeffe2834 Hi, I'm sure what you mean? 🙂 The cutting list is simply what I sent for the pro forma invoice, and had made, some bracing pieces were used around the top, some just kept as spares or for additional bracing if needed as it is a proto type. The 50 x 50 bracing box section is not on the cutting list and had to be ordered as a whole 6 meter length. I had a short section left over from a previous build so got away with one length, but you would need about 8 meters in total. 👍
@@martinokeeffe2834 No problem mate 🙂 For this pump fed one, I am aiming for around 11,500 lph, which is a once per hour turn over of my pond. But without testing it, which I haven't done yet, I won't know for sure. As it is the first pump fed one of this size I have built. My smaller current gravity fed bio is only about 200 litres with 75 litres of K1 micro and 5,000 lph. The outlet grill free area is about 300cm2 compared to a 4" pipe of approximately 80cm2. Water moves at a different speed though many small slots or smaller holes than it does through a single large bore pipe, as per fluid dynamics (friction forces and resistance increase with a smaller cross sectional area, and more towards the inner edge of the bore, than the middle where there are less friction forces so is non uniform in flow) But also if you have too small a free area cm2 of outlet grill, it can also trap media by suction, causing it to act like a static bed accumulating waste and going bad bacterially. And too fast a flow rate can also lead to incomplete nitrification, and elevated ammonia nitrite levels. 👍
Thanks, 🙂 That's great advise, and works 100% when i'm routing with wood, 👍 I did try that with a test piece of scrap polypropylene first, but it just chews the plastic up and the chips melt and bond to the bottom of the cut, regardless of what RPM speed you make the cut, and it makes a horrible mess. It's the worst stuff i've ever routed, as it's soft and melts easily at a very low temperature. Conversely edge profiles are easy when the chips are ejected, chamfer cuts are simple and clean... 🙂
Cracking job Dave.
Cheers 👍
Hello Dave's what a excellent job you done on your moving bed filter mate , I will make one later next year once I finish my upgrades on my pond, so I hope I can pick your brain some time for your help and advice. 👍👍👍
Thanks, 🙂
yes that's no problem 👍
Looks great Dave. Look forward to seeing in place & working. Well done mate, watched series from start to finish. Will start having a go soon over the winter months, ready for the Spring.👍
Thanks, 🙂
I'd say it's not for the faint hearted, but it's not rocket science either...
The biggest tip would be to do lots of practise pieces with scrap sheet, and make some smaller items to start with.
I made my current smaller polypropylene bio tank, and a 4" PVC skimmer I made for my current pond build...👍
@@DavesKoiPond Thanks Dave👍
nice work
Thanks, 🙂
How much do you recon it cost to build? And is it hard to learn how to weld. Stunning pond and set up
Thanks, 👍
I'm trying to remember now...
The plastic sheet and 40 x 40 square tube was about £300 delivered but the welding rod and welder I had from my previous bio build.
plus a few bits and bobs for the air line. at about £20...
Welding isn't difficult if you are capable at wood work, and can build things from scratch.
But you do need to practise on scrap pieces if you've never done it before.
I made my pond skimmer in welded PVC sheet, then a flange for my pond window in PVC sheet, before making the first bio tank.
So I have had a bit of practise...
Top work 👌
Cheers, 👍
Great job
Cheers 👍
I have not welded polypropylene, but i've done a few HDPE projects. HDPE welding seems much weaker for some reason.
I've not done any HDPE welding, but seen youtube videos of RV water tanks being made, and they look pretty tough.🙂
Maybe it depends on the thickness of sheets that is welded?
ruclips.net/video/ddLlSRtYqFU/видео.htmlsi=5TnAp_tJynvdpNMm
I've done PVC welding before and that was a real pain, as even slightly too much heat and it scorches black really easy.
This a top 🔝 job 👏👏😎👌
Cheers, It's been a bit of a hard graft for me,😄
but worth the effort 🙂
@@DavesKoiPond where did you buy the material I want to give a try next year 😁👌
@@Crazyforkoiandgoldfish
Oadby plastics
www.oadbyplastics.co.uk/
How much do you reckon it cost you to build and what supplier did you use? Looks great 👍
Thanks 👍
Some of the stuff I already had, the heat welder and welding rod.
but the 12mm plastic and box section came to £293 inc delivery, the 9mm for the lid was a piece I had left over from a couple of years ago.
The cutting list and supplier I used are also in the descriptions of the part 1 and 2 videos.
www.oadbyplastics.co.uk/
Hello Dave could you please send me your exact cutting list please
Yes mate no problem, It's also the first link in the description 🙂 postimg.cc/hXqCfRC6
It doesn't have every single one of the smaller pieces or the lid, some of the smaller ones I cut myself, as I needed to build, and then measure exact sizes.
BTW this is still a prototype, it's not been tested in situ and found working yet 😄
Hello Dave could you please check your cutting list there seems to be a discrepancy on your bracing box section
@@martinokeeffe2834 Hi, I'm sure what you mean? 🙂
The cutting list is simply what I sent for the pro forma invoice, and had made, some bracing pieces were used around the top, some just kept as spares or for additional bracing if needed as it is a proto type.
The 50 x 50 bracing box section is not on the cutting list and had to be ordered as a whole 6 meter length.
I had a short section left over from a previous build so got away with one length, but you would need about 8 meters in total. 👍
Hello again Dave sorry to be a pain but what would be your flow rate through these grills?
@@martinokeeffe2834 No problem mate 🙂
For this pump fed one, I am aiming for around 11,500 lph, which is a once per hour turn over of my pond.
But without testing it, which I haven't done yet, I won't know for sure.
As it is the first pump fed one of this size I have built.
My smaller current gravity fed bio is only about 200 litres with 75 litres of K1 micro and 5,000 lph.
The outlet grill free area is about 300cm2 compared to a 4" pipe of approximately 80cm2.
Water moves at a different speed though many small slots or smaller holes than it does through a single large bore pipe,
as per fluid dynamics (friction forces and resistance increase with a smaller cross sectional area, and more towards the inner edge of the bore, than the middle where there are less friction forces so is non uniform in flow)
But also if you have too small a free area cm2 of outlet grill, it can also trap media by suction, causing it to act like a static bed accumulating waste and going bad bacterially.
And too fast a flow rate can also lead to incomplete nitrification, and elevated ammonia nitrite levels. 👍
Take the cut in two passes it looks like it’s to much for your cutter
Thanks, 🙂
That's great advise, and works 100% when i'm routing with wood, 👍
I did try that with a test piece of scrap polypropylene first,
but it just chews the plastic up and the chips melt and bond to the bottom of the cut, regardless of what RPM speed you make the cut, and it makes a horrible mess.
It's the worst stuff i've ever routed, as it's soft and melts easily at a very low temperature.
Conversely edge profiles are easy when the chips are ejected, chamfer cuts are simple and clean... 🙂