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post #590 of (permalink) Old 03-05-2012, 11:46 AM
Join Date: Mar 2012
Location: Lebanon
Posts: 4
Originally Posted by humblepie View Post
The reason for your low flow is the way you set up your media.

Normally if you are using high density filter floss, which is very restrictive in regards to water flow rate, you want to keep it overall very thin. The denser the material then the "thinner" you need to use for those pads.

Also there is a bit of a problem with filter floss. Usually it is very dense and will filter out everything. The problem is that large particle will clog it faster than smaller particle. If you have a LARGE space to use filter floss, such as a modified circumference bucket filter like a fluval fx5 or the odyssea 500 then you can use the dense floss as the first line of filtration.

If you are using a canister, then placing that dense floss first will make it clog to quickly as there isn't enough surface area for that floss. Which is why in canisters most users will place the dense floss last.

Typical setup for a canister filter is a thick piece of low density mechanical filtration. Usually a very porous and coarse sponge to fill the entire first tray.This allows that sponge to collect the bigger particulates first without clogging. The smaller particulates in the water will be later caught by the denser floss. After the coarse sponge, one then places the bio filtration media. This is to allow the bio filtration to eat up as much of the ammonia and nitrites as possible. During initial setups, many users will place chemical filtration next in line after the bio filtration. This is because there may not be enough bacteria built up on the bio filtration to completely eat all the ammonia and nitrites. So a chemical filtration method, such as using zeolite, is needed for a bit. Once enough bacteria has formed, then the chemical filtration can be swapped out for more bio media if desired.

Final filtration for a canister filter is typically the super dense filter floss. Only a very thin layer of such material so as not to overly restrict the flow rate. Nor by this point should there much particulates needed to be filtered out except for the very small particles.

Eventually over time the filter materials will clog up. The coarse sponge filters are easy to clean. Just squeeze out and knock off all the gunk. The dense filter floss can be re-used after cleaning, but is typically more of a hassle than it is worth. Easier to just toss the dense floss and replace it new. The amount of bacteria lost over doing this, as some will also grow on the dense floss, should be negligible.

So for a bottom up canister like the sunsun you want to stack your media like this:

Dense Filter Floss
Chemical (optional or more bio)
Bio Media
Coarse Sponge

This gives you the optimal filtration for these styles of filters without overly restricting flow rates. Give that a try.
Hi there

Great thread.

I bought the SunSun on Saturday to replace a DIY filtration system I had for my 180G tank...must say its pretty silent and I have to sometimes put my hand on the filter to make sure its running at all I got the 304/B model which is supposed to churn out 1400 Liters per hour...(roughly 370GPh) priming it was a major PITA until i came across this thread and filled it up with water prior to powering it on...then it worked like a charm.

Currently my tank is pretty empty in terms of stock with one Bala Shark, two Clown Loaches and one Tiger Barb and seven red crayfish I like to call the seven dwarfs as they tend to put up quite an act...they will be moved to another tank soon as they cannot seem to coexisist with any form of plantations... I plan to stock some more but I am taking it nice and slow...don't want to over do it...most likely it will be a school of tetra neons (around 15 or 20), a couple of angels, my bala shark and a mate and of course the loaches and the barb.

anyways my question is regarding the tray stackup of the per the quoted thread, the trays should be stacked as:

Dense Filter Floss
Chemical (optional or more bio)
Bio Media
Coarse Sponge

is this from top to bottom or the other way round?

what I have right now is

Top tray: white fiber stuff similar to what came in the trays originally ( I threw that one out as I thought it smelled chemical)

Middle tray : ceramic rings from my previous filter

Bottom Tray: Carbon bags also from my previous filter...

Flow is not as I was hoping...could it be from the stackup? should I change this?

thanks in advance.
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