[ootyboy]

My pond has sprouted a nasty leak, and I've decided to not try and patch the Epoxy material any longer, and go with either Poly or a liner. In the mean time, I am rethinking my filtration system. Here is what I currently have:

1 X 2" Bottom Drain
1 X 3" Retro Bottom Drain
1 X no Niche Skimmer

They feed into an Ultima 10,000 (All pump driven -- Yes I know this is not the best design) for Mechanical

Ultima feeds 2 biological filters: One with Bacterial house and the other a Oase Biosys 18 filter feeding back into the pond.

Here are my thoughts on what I would like to do when I redo the pond in the next couple of week, and would appreciate any feedback:

1 X 4" Rhino II Aerated Bottom Drain (Gravity Fed)
1 Wave 36 Vortex Settlement Tank - From the bottom drain
1 Wave 36 Vortex Tank (With Japanese Mat) - Second mechanical filter
Next in line would be the Ultima 10,000
Which then feeds into the Biosys 18 and the the large bio filter area/waterfall that I build that contains Bacteria House media (and will soon have Japanese Mats)

Here are my questions:

Would this be adequate for a 9000 gallon pond?
Do I really need 2 Wave 36 Vortex filters before the Ultima or should I go directly from the settlement tank into the Ultima?
Should I add more biological filtration after the Ultima than what I currently have?

My fish load is currently rather light, but I am planning on adding a few more fish within the next few months. I think total fish population is less than 40" currently.

My plan is to use the Vortex tanks and the Ultima as purely Mechanical. However, I would like to possibly increase my Biological filtration along the way. Any suggestions/ideas would be greatly appreciated.