| E for effort
The most important things to remember when designing your particular choice of prefiltration are:
1) a closed system is a trapped body of water that will build up organic material very quickly if allowed.
2) Koi are dirty animals in what they throw off and produce and also what they keep in suspension due to their activity
3) Koi live in organic water so obsession about this can become misplaced and paranoid
4) Having said that, high organics lead to more complex ecosystems and excess biomass.
5) But the presence of some organic material is usually easiest and maybe even best managed with a series of settlement chambers. This has the added advantage of the creation of transitional biofilm mix as the water goes from organic/inorganic composition to finally mostly inorganic ( ammonia laden). But of course this must all be done well or you will gravitate to a heterotrophic bacterial composition in your filters and bad things will linger close by. - JR
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