Originally Posted by
Posiden
http:///forum/post/3144447
Sorry, but I will pick the definitions apart. Nowhere in the reading is a filter mentioned. It doesn't even mention one when it references an engine crankcase. We all know there is an oil filter in the oiling system of an engine. Yet it is left out of the definition cause filtering is separet form the sump.
In the other definition for a reservoir. Yes, a recptical for liquids can be placed above a tank, it still doesn't reference a filtering property. Like I mentioned before, it is not a common thing to see a true sump in a system. And so the flow is adjusted acordingly. But they are not sumps.
On your pond, again you not running a sump. It is a bead filter as you stated.
Yes, I agree you can get more turnover with powerheads due to the lack of head height. "IF" the powerhead is kept high in the tank. A power head placed lower in the tank will not pump as much water as it would if it were kept close to the surface. That's one of the reasons why skimmers aren't very tall. If they are tall they still run in shallow water. It doesn't matter how much gallonage there is, a foot under water is the same all the way around. Power heads loose thier ability to push water efficently when any head height is imposed on them. The same thing applies to a closed loop, If it is kept high and not under the tank It will produce more flow. If it is under the tank or even going through a OM 4 way, then head height imposed on the pump is huge, giving you less flow. Giving the reason they run Sequence Reeflo pumps and plenty of pipe diameter to go with it.
The load on a pump will dictate the actual wattage being used..No? I have scene posts where folks have meters on thier pumps and they don't use as much energy as they are stamped to use.
Its called reading comprehension. It dosn"t specifically say filter but since a filter is is a resivior used to hold liquid and since it is typically the lowest point in the system makes it a sump. This would even inclued a cannister filter as described by definition 4.
Also a powerhead pumps the same anywhere in an aquarium because it is not effected by head untill you try and pump water above the water level. A powerhead on a skimmer has head because it pumps water above the water level. A closed loop does not have head even with the pump under the aquarium. The siphon created by the intake side counteracts the head on the outake. The piping will create resistance but it does not have head height. Its simple physics
Anyway, I'm done with this topic
your reaching really far.