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<TD><H1><A HREF=http://shop.tjb-inc.com/Category2>Water Garden & Pond Products</A> / Pond Aeration - Garden Ponds & Larger Ponds</H1></TD>
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<P><div>POND AERATION</div>
<div><a name="A good level of dissolved oxygen">A good level of dissolved oxygen</a> Is essential for aquatic life</div>
<h3><a name="Why Dissolved Oxygen">Why Dissolved Oxygen</a> is Important</h3>
<div>Dissolved oxygen analysis measures the amount of gaseous oxygen (O2) dissolved in an aqueous solution. Oxygen gets into water by diffusion from the surrounding air, by aeration (rapid movement), and as a waste product of photosynthesis. </div>
<h4>Environmental Impact:</h4>
<div>Adequate dissolved oxygen is necessary for good water quality. Oxygen is a necessary element to all forms of life. Natural stream purification processes require adequate oxygen levels in order to provide for aerobic life forms. As dissolved oxygen levels in water drop below 5.0 mg/l, aquatic life is put under stress. The lower the concentration, the greater the stress. Oxygen levels that remain below 1-2 mg/l for a few hours can result in large fish kills.</div>
<div>Dissolved oxygen concentrations may change dramatically with lake depth. Oxygen production occurs in the top portion of a lake, where sunlight drives the engines of photosynthesis. Oxygen consumption is greatest near the bottom of a lake, where sunken organic matter accumulates and decomposes. In deeper, stratified, lakes, this difference may be dramatic - plenty of oxygen near the top but practically none near the bottom. If the lake is shallow and easily mixed by wind, the DO concentration may be fairly consistent throughout the water column as long as it is windy. When calm, a pronounced decline with depth may be observed.</div>
<div>Seasonal changes also affect dissolved oxygen concentrations. Warmer temperatures during summer speed up the rates of photosynthesis and decomposition. When all the plants die at the end of the growing season, their decomposition results in heavy oxygen consumption. Other seasonal events, such as changes in lake water levels, volume of inflows and outflows, and presence of ice cover, also cause natural variation in DO concentrations.</div>
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<div><strong>TJB-INC</strong> offers several different styles of Areation Systems. Both for large ponds or lakes, and for smaller water gardens like the kind we would enjoy in our own backyard.</div>
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