"Paul" wrote in message
...
Hi, was wondering if someone could tell me if I did the right thing here. I
built a Biofilter for my pond.It is 12X7X2. The one I built is 9gal.
basically a square Rubbermaid box. The pump (1200gph) pumps into the "top" of
box through an 18W UV light, then goes into filter through a 1 1/4" thick Med.
filter pad. It works its way down through the filter media. The media is a
combination of Bio Ceramic Barrels,Two bags of Lava Rocks crushed into smaller
sizes and regular Supra media, then finally exits out the bottom into pond.
Will this design keep water ok? Thanks..............

The efficiency of any biofilter depends mostly on the bioload in the pond. I
suspect that if your bioload is low to moderate, it should work well for you.
If it is high, you may want to attach an additional cell to the existing one.
Having said that, I wouldn't go through the trouble until you've let this one
run long enough to see if it is going to handle the load. If it does, then
you're done. If not, think about adding another cell. The wonderful thing
about biofilters if they are constructed properly is that you can always add
more cells to the flow (if you have the room).