A little help with filter design for new pond, please?

[old-muel]

Ok so sorry if a bit longwinded I'll try get to the point-, My existing small pond is approx 1,000 litres (250gallons) & running an external upflow bog filter in a 220litre (55gal) blue plastic barrel, pretty much ala ozponds' design except im using the whole barrel instead of half + im using rocks from large to small in the bottom half then expanded clay balls (hydroton, leca etc) in the top half, which are then planted into- works absolutely brilliantly, got tree canopy above & struggled bad with tannins & this actually cleared to crystal overnight & has stayed that way since! Minimal fish & i feel it's decently oversized filtration. Aaanyway... Im adding a new pond that will be maybe 4000-5000 litres (1,000g) & the two will be connected via infinity/negative edge + liner overlap. I'm gonna need some extra filtration. Space is at a premium so no inground bog/wetland & probably not even extra external barrel (maybe if absolutely necessary) but what i'm planning is I've got one of those large 102cm diameter, 261 litre (69gal) aquascape fountain bowls that i can incorporate inside the liner among edge boulders, aquascape sell a biofilter kit for the fountain bowl that's basically bio balls in a mesh bag with a sponge mat that sits on top. Seems expensive for what it is, they state this biofilter can filter up to 13,500 litres (2,970gal)! So im thinking this is what's commonly called a moving bed style biofilter?, Just the moving water is moving the balls yeah? I've seen filters people called "fluidised media" style that have this with active aeration, what's the difference here? Do you guys think this would be adequate? The existing bog with it's clay balls would be providing significant mechanical filtration I'd think so will adding just a dedicated biofilter likely be sufficient? Also would K1 be better/more efficient than the bio balls? Wondering about DIY'ing with K1 & a sponge mat instead of the aquascape kit & that would possibly be cheaper too.
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[GBBUDD]

Ok so sorry if a bit longwinded I'll try get to the point-, My existing small pond is approx 1,000 litres (250gallons) & running an external upflow bog filter in a 220litre (55gal) blue plastic barrel, pretty much ala ozponds' design except im using the whole barrel instead of half + im using rocks from large to small in the bottom half then expanded clay balls (hydroton, leca etc) in the top half, which are then planted into- works absolutely brilliantly, got tree canopy above & struggled bad with tannins & this actually cleared to crystal overnight & has stayed that way since! Minimal fish & i feel it's decently oversized filtration. Aaanyway... Im adding a new pond that will be maybe 4000-5000 litres (1,000g) & the two will be connected via infinity/negative edge + liner overlap. I'm gonna need some extra filtration. Space is at a premium so no inground bog/wetland & probably not even extra external barrel (maybe if absolutely necessary) but what i'm planning is I've got one of those large 102cm diameter, 261 litre (69gal) aquascape fountain bowls that i can incorporate inside the liner among edge boulders, aquascape sell a biofilter kit for the fountain bowl that's basically bio balls in a mesh bag with a sponge mat that sits on top. Seems expensive for what it is, they state this biofilter can filter up to 13,500 litres (2,970gal)! So im thinking this is what's commonly called a moving bed style biofilter?, Just the moving water is moving the balls yeah? I've seen filters people called "fluidised media" style that have this with active aeration, what's the difference here? Do you guys think this would be adequate? The existing bog with it's clay balls would be providing significant mechanical filtration I'd think so will adding just a dedicated biofilter likely be sufficient? Also would K1 be better/more efficient than the bio balls? Wondering about DIY'ing with K1 & a sponge mat instead of the aquascape kit & that would possibly be cheaper too.
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I think your looking at this a bit backwards, so you made an upflow bog/ wetland filter this is more of a biological filter. bogs do not remove waste and debris but try and provide enough bacteria to keep these from becoming issues like elevated ammonias nitrates phosphates etc. if space is tight the most efficent filter that has the smallest foot prin't imo is the rotating drum filter. even the smallest of these filters along with a upflow wetland would insure your desires for crystal clear water and the least amount of issues.

 

[old-muel]

Thanks for the reply. I know my bog filter is more of a biological filter what I meant was that since it's more of a biological filter & I'm increasing the pond volume significantly & knowing I'll need MORE filtration, i don't know what TYPE of extra/second filter I really need.
The existing bog does actually do at least SOME removal of waste & debris as it has a bottom drain & I occasionally empty it & muck comes out.
I dont think im interested at all in a rotary drum filter, seems complex beyond need.
I already have the 260 litre fountain bowl so i do want to use that as at least part of my extra filtration. Basically I'm trying to figure out if I can use the bowl and it alone provide enough extra filtration - and how to best set it up. I could just set it up as a bog- then I'd have 260+ existing 220 = 480 litres of bog which would be around 10℅ of the pond volume which I think could/should be somewhere around a sufficient number but from some reading it looks like the moving bed types I described might make even better biological filters than bogs? (aquascape state up to 13,500 litres with this bowl with bioballs) I'd love to know if that is the case coz if it is I will go with that. So that's my decision do I fill the big bowl with gravel/pebbles or with bioballs?
Like I said I could probably squeeze in another blue barrel if the bowl turns out not enough but I'd love to make just the bowl work.

 

[GBBUDD]

If you have room for a second barrel then my next go to would be a nano bead filter from gc tek they do make small ones and cleaning is a simple back wash. Photo enclosed is looking through turbid water down 5 and a half feet bead and bog with heavy fish load. The orangy brown in the center of the photo is the bottom of the pond that the fish root in all the time

I do hate when I get done with a post and don't hit the send / post button