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There are several things going on at the same time. First, you have an air-stone in a tube filled with water. The water is in the tube because air pressure pushing down on the top of the tank forces the water up the tube. When you force bubbles up the tube with the air-stone, it draws water up with it.
The tube is now acting as a siphon, drawing water out of the tank to replace the water that is flowing out of the top of the tube. In order to get IN the tube, the tank water must flow through the gravel because the intake to the tube is on the bottom of the filter. This downward flow of water draws with it all the debris that the fish leave behind. This action causes the gravel to grind up anything coming through it.
All this debris is left on the floor of the tank beneath the filter.
An added benefit of the under-gravel filter is that having all this organic debris under the filter keeps the tank clear of not only the debris, but also the microorganisms that feed on it. You have a clearer, healthier tank.
But you should also keep a back filter running and use a diatomaceous earth filter occasionally.
- wjs1632 -
Sherwood Ritchie
Wiki User
∙ 13y agoThe primary purpose of gravel in a water purification system is to distrubute the flow of the incoming water over the entire treatment bed. A stream of incoming water that needs treatment will be forced to flow through the channels between the gravel nuggets/pebbles. Even if the flow coming in is all in a small area, it will branch out as it flows through the gravel into many widely spread paths throughout the gravel bed.
Also, in a water purification system, gravel is usually the first level of particulate filtering. Only particles that are smaller than the gaps between the rocks can flow on through to the next level of particulate filtration. The larger materials are strained out and remain on top of or within the gravel until they break down enough to pass through the gaps or are scooped off during periodic flushings or other cleaning.
Wiki User
∙ 8y agoThis layer retain big insoluble impurities.
Wiki User
∙ 9y agoGravel is cleaner than sand and rocks
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What do fine sand and gravel do to water?
The gravel and sand filter out smaller particles from the water
What tool can you use to separate rocks and water?
You can use a coffee filter in first than put your water in than the gravel and that is how you separate gravel and water...:) or you can get a screen like a drainer and pour all of your gravel and water in that.....:)
How do you separate sand gravel and water?
I would add enough water to dissolve all of the salt. Then pass it through a strainer to collect the gravel.
Do 100 ml of gravel and 100 ml of water have the same mass?
No, the gravel sinks when placed in water and is therfore more dense than water. This means that given two equivalent volumes one of water , one of gravel, the mass of the gravel will be greater than that of the water.
What physical properties can you use to separate salt and water?
1. Put the mixture of gravel and salt in water. 2. Salt is water soluble, gravel not. 3. Filter: the salt is in the solution.
What do fine sand and gravel do to water?
The gravel and sand filter out smaller particles from the water
What tool can you use to separate rocks and water?
You can use a coffee filter in first than put your water in than the gravel and that is how you separate gravel and water...:) or you can get a screen like a drainer and pour all of your gravel and water in that.....:)
What are the main things in a water filtration device?
layer of sand then a layer of activated charcoal then a layer of gravel.
How do you separate water and gravel?
BOil the solution then filter it out
What is the best natural filter for ground water?
gravel
How do you separate a salt gravel and powder mixture?
1. Put the mixture of gravel and salt in water. 2. Salt is water soluble, gravel not. 3. Filter: the salt is in the solution.
Does salt water or fresh water filter sand gravel soil and pebbles better and why?
Water does not filter particles: it is the other way around. Pebbles, gravel, and sand are used to filter water, with the smallest particle size (sand) filtering the most particulates from the water, whether it is salt water or fresh water.
How do you separate sand gravel and water?
I would add enough water to dissolve all of the salt. Then pass it through a strainer to collect the gravel.
Does salt water or fresh water filter sand gravel soil and pebbles better?
fresh water and peppels fresh water and peppels
Can you separate gravel and sand with a coffee filter?
As salt is soluble in water, mixing salt and sand in water would result in solid sand, and salt water. When poured through a coffee filter, the sand would remain in the filter, while the salt water would flow through. After letting the water evaporate, salt would remain. You will be left with the two separated solids.
What does sandstone aquifer mean?
An underground layer of water-bearing permeable rock or unconsolidated materials such as sand or gravel.
What are undergravel aquarium filters?
An under gravel aquarium filter is one where the filter is located beneath the gravel. The filter is responsible for keeping the tank oxygenated and looks better out of sight.
