Thought I would drop by and share smth I recently learnt from a few German fish forums. Been trying it out for a few months and I'm sold.
Water in Most of the eheim canisters flow from bottom upwards. The recommended media arrangement (assuming 3 trays) are as follows:
(Bottom most) tray 1 = mechanical filtration [could be sponge or eheim' mech pro media] -> tray 2 = mechanical or bio media -> tray 3= bio media + white floss pad (top most)
However most German fish keepers do the following instead: they place the white floss pad above the mech filter media. So for example in my case where I use 1 mech + 2 bio media ratio, it is as follows:
(Bottom most) tray 1 = coarse sponge pad + white floss pad on top -> tray 2 = bio media (I use biohome) -> tray 3 = bio media (I use substrate pro + purigen on top (top most)
And I guess it makes sense. We know the general principle of having mechanical filtration before biological filtration. Moving the floss pad to the bottom most tray simply builds on that.
Pros:
- no reduction in fine filtration capacity
- I find that my bio media in tray 2 and 3 stay significantly cleaner for a longer period
Con:
- being at the bottom tray, it's more hassle if you wanna swap out just the floss pad.
- just remembered another: I find that I need to wash out/replace the white filter pads more often. My guess is that in the usual arrangement, the bio media helps with some of the mechanical filtration, and so there's less to clog the floss pad. With the floss pad at tray 1, the floss pad has to do more of the mechanical filtration work. Although this results in more replacement/washing of the floss pad, this is accompanied by the second pro above.
Sharing for info. Any thoughts appreciated!
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