Chapter 17 marine bio test

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Chapter 17 marine bio test

Those designed for chemical filtration affect the quality of the water flowing through or over Chapter 17 marine bio test.


As for mechanical filtration, it's a process used mainly to sieve water of large undissolved floating particles. Notice the word 'mainly' in all three forms of filtration described above, as all incorporate the other forms of filtration to some lesser degree. Before going further, one of the most misunderstood terminologies associated with filtration equipment is 'Turnover rate!

One thing for sure is that flow rate, without using mathematical equations is more guesswork than an accurate statement.

More on this when you read about protein skimmers! Lets now take a look at the following equipment designed specifically to support various filtration processes. Each type of equipment will discuss its function and how it operates. Also, all shown photos are clickable, which often allows a larger file to be seen.

At monthly meetings my questions always centered on natural looking aquariums and how to improve their water quality. The answers in that timeframe were always water changes and a good growth of live plants. To some extent, still good advice these days.

At one of the meetings a guest speaker who had just come from Europe showed a new device that could draw water through bottom gravel.


He said it would result in a healthier aquarium. The item was called the 'French Invisible Filter. The speaker said this was the first showing of this item in the United States and he thought it might prove to be a major improvement in aquarium keeping, and how right he was!

The gentleman had only two such devices with him and was kind enough to offer one for the night's auction before returning to Europe the following day.

I was the only bidder and purchased the item for twenty-five cents, which was big money for me in those days as I can remember a newspaper at that time costing two cents!

After purchasing this 'filter' it was placed in my gallon aquarium within a few inches 7. Within a month the dark line of detritus just below the gravel's surface became much less visible. In those days all I knew was that waste products were being removed somehow and my aquarium looked cleaner, and it appeared I had a healthier environment for my guppies.

At a following meeting I was asked if I thought the filter was working as discussed in the previous meeting and then explained what changes I had seen. But was laughed at by many of the 'experts,' nevertheless, over the next few decades the undergravel filter experienced design changes and became a standard and quite useful aquarium accessory.

The UGF is of course no longer tube-shaped and has for a very long time used a slightly raised perforated plastic plate that covers the aquarium bottom. Its upper surface holes or slots are small enough to prevent gravel, which is placed on top of the plate, from falling through yet large enough to allow water to easily flow through its numerous openings.

Each plate also has one or more vertical water flow tubes that can be equipped with an airstone or powerhead, which push or pull water through the tube, thereby producing a water flow through the gravel covering the plate.

It's this flow that delivers oxygenated water to nitrifying bacteria living on the surface of the gravel particles. Unfortunately, these gravel particles act somewhat like a mechanical filter trapping waste matter.

Chapter 17 marine bio test

Therefore, monthly gravel cleaning using gravel vacuums is highly recommended to keep the gravel clean. And gravel substrate depth should be limited to 1 to 2 inches 2.

When water is pulled up the tube, thereby drawing water downward through the gravel bed and under the bottom of the plate towards the lift tube, the UGF system is referred to as a conventional UGF system.

When water is pushed down the tube, thereby forcing water to flow up through the gravel bed, it is referred to as a reverse-flow UGF system.

There is some thought a reverse-flow system is slightly more beneficial than a conventional UGF system because dissolved oxygen is present at both the lower level of the substrate and at its upper surface where it meets the systems bulk water, thereby enabling nitrification at both areas.

Nevertheless, both methods consume dissolved oxygen and return deoxygenated water back to the bulk water. Without additional equipment providing aeration, UGF equipped systems using powerheads to drive its circulation water always have a somewhat low dissolved bulk water oxygen content.

Said condition can negatively affect animal health, therefore, it's a parameter that should be monitored and corrected as required. Air bubbles from an airstone located in the bottom portion of the lift tube can be used to raise water inside the tube, and it will exit at the aquarium's water surface.

This upward flow in the tube causes water to be drawn down through the substrate, which provides dissolved oxygen to the bacteria living on the upper gravel particles. At the same time, aquarium water surface turbulence occurs where water exits the lift tube, resulting in replenishing some of the dissolved oxygen used in the nitrification cycle.

An additional benefit at the exit of the lift tube is the removal of some phosphate from the aquarium water, as the spray can leave a salt deposit heavy in phosphate if presenthelping somewhat to reduce this unwanted compound. No doubt messy, but somewhat Bob Goemans Chapter 12 – Algae: the Good, Bad, and Ugly Now with the system goal chosen, necessary equipment purchased to establish it, and well armed with system filtration techniques and seawater generalities, the next logical step is to explore what that system will need in on-going maintenance to remain a healthy environment for its inhabitants.

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Dr. David L. Peterson is professor emeritus at the UW School of Environmental and Forest Sciences. He is a member of the Skagit Climate Science Consortium, and was co-recipient of the Nobel Peace Prize as contributing author for the Intergovernmental Panel on Climate Change.

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