Quote:I played with small ornamental pond filtration for a fww years, would be interested to see what you have for this.I keep telling people I could design a filter for a duck pond but no one believes me...
Then you know the surface area of the filter is important to water filtration. But there are other things going on in a filter. First you have to remove the particulates.... Debris, plant materials, dissolved poo, etc etc.... The last is what I think makes people assume I am crazy. But if you treat this as if it were a black water problem.... or lowgrade sewage treatment instead of "Pond must be clear and drinkable"
first step is to filter out the chunks..... Which you can do with a prefilter made of swamp cooler pads.... Large stuff. They can be knocked off into the compost pile every so often... then rinsed and replaced.
Then the smaller chunks ..... smaller fiber filter.... Cleanable
Now you can start the biological filter.... Coarse gravel, Medium gravel, Sand, separated by screen. In those gravel/sand particles will reside Aerobic bacteria. These are infinately better at dealing with organic waste. As long as water travels through them to provide oxygen they are good at what they do. Once the water makes it through them then you can deal with the inorganic.... In aquariums Charcoal is one of the absorbers.... but in a pond system you can use pond plants.
The one difference is Mine would be cleanable at each stage so the filtration system could be reset every so often.
It may even make sense to have each medium be in separate containers.... Like I said I havent built one yet
deb
Yep, am familiar with upflow sand/gravel filters.
Agrees, detritus must be removed from water column.
I did 4 separate containers, each with a valved waste drain, and a valve between each container.
Gravity flow, containers set at same level as pond, pump in last container.
1st was vortex to drop heavy debris out, water comes from bottom of pond and enters on tangent to 'spin' out debris, exits at top thru coarse filter.
2nd, multi layered filter, coarse to fine.
3rd, bio media with aeration.
4th, nothing but submersible pump, returns to pond.
Smaller more frequent water changes done by isolating vortex chamber and dumping heavies.
All was small scale...it was a prototype, 'let's play with this concept'.