Skimmers

[StirCrazy]

Originally Posted by Bob I

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Again you don't understand the premise. I cannot explain it better, but no it will not happen. Simple concept known as surface tension keeps it from happening.

Ok Bob, got you some info on it from a pond page.

"Mechanical aerators agitate water to produce liquid/air contact, while underwater diffusers introduce bubbles from a depth to achieve oxygen transfer and mixing. Bubble type aeration systems are replacing many mechanical aerators because of their low maintenance, reliability, safety, flexibility and overall efficiency. They excel where small amounts of aeration are needed in many locations. Bubble aerators are also better at removing gases, such as ammonia and carbon dioxide. Diffusers are made to deliver either coarse (approximately 6 mm), medium (approximately 3 mm), or fine (approximately 1 mm) air bubbles. Coarse-bubble systems require the lowest air pressure and are very resistant to clogging, but are about a third as efficient as medium-bubble systems in transferring oxygen to the water. The medium-bubble diffuser requires only slightly higher air pressure, but its superior oxygen transfer more than compensates for the increase in maintenance due to occasional clogging. The fine-bubble diffuser’s superior oxygen transfer usually does not compensate for its higher-pressure requirement and much more frequent clogging."



SO as you can see a bubbler type set up is the most efficient at raising O2 levels and driving off other gasses, and the smaller the bubble the higher the efficiency.

here is a chart on the different amounts of O2 that can be put into the water by different aerators. air compressor liner type is you basic bubble stone on a fish tank, and the water pump with venturi is your basic skimmer.

Aerator
Flow rate
Watts used
Grams O2 per hour
Cost per 100 grams
Lazy Stream 12" drop
10gpm
150watts
1.2
$1.26
Babbling Stream 12" drop
10 gpm
150
2.4
.63
Waterfall 12" drop straigh into pond
10gpm
150
1.4
1.05
Waterfall 2-24" drop fallng on rocks
10 gpm
200
3.1
.65
Fountain
5 gpm
100
1.6
.63
water pump with venturi
4 gpm
100
4.0
.25
Air compressor linear type 1
1 cfm
30
4
$0.06



Don't know what else to say to you on the Bob aside from please read up on it if you are having a hard time understanding it as what you are thinking isn't true.

Steve