| Swordfish,
You will see in the picture that i have two 4" pipes pooping up in the clean reservoir and all my vortex units are connected together with 2 x 4" pipe work to help keep a good head and flow through the filters. For me to make have a single pipe in the center i would of had to make some king of header up to accommodate both 4" pipes and be big enough not to slow down the flow which in turn would create a head loss within the filters.
Also another reason is that its great to actually see how much if any poop.debris is getting by and this way all i have to do is have a quick look in and i can see straight away.
John,
Yes you are correct when using K1 as a biological stage of filtration plenty of air is needed.
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Regards
Gazza
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