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Attach a low-frequency wave and in general the intensity of the smaller of the two times a day. This tidal movement caused by gravity from celestial bodies to the mass of water on earth. This movement is also influenced by the rotation of the earth itself as well as the layout of the island and the continent. Therefore, the high and low tide in the earth’s movement is mainly determined by the distance or location of the sun and moon to the earth.

Ecologically most important wave was in the tidal zone. In part somewhat in effect reduce it to the base, and in the oceanic tidal waters affect air exchange and rather deep. Waves can be generated by wind, tidal and sometimes by earthquakes and volcanic eruptions (called a tsunami). Waves have the nature of the destroyer. Biota that live in the tidal zone must have resistance to blow wave.

Waves easily damage the algae-algae from the substrate. Wave allegedly also change the shape of the reef-building corals. Wave mixing gas atmosphere to the surface of the water so that gas exchange occurs. Overall, resultanta force on earth-moon system is equal to zero. However, each individual particles on the surface of the earth to experience different styles of the month.

Similarly, the centrifugal force experienced by a point on the earth’s surface will be different as a result, resultanta of these forces vary at any point on the earth. Style is what is known as a style “tidal generator” (Tide generating force). With the tensile force strong month, then the mass of water on the Earth closest to the moon would be interested in a swell so that the waters will rise and cause tides.

At the same time, part of the earth behind it will have ups anyway. While the other side which is perpendicular to the axis of the earth-moon will have subsided. A more important factor affecting the size of pairs is the position of the moon-sun to the earth. If there is a month between the earth and the sun, a third of this celestial body is in a straight line is called the new moon (new moon). Was when the earth is between the moon and the sun is called the full moon (full moon).

Total Dissolved Solids (TDS)
Total Dissolve Solid (TDS) which is a measure of the solute (both organic and inorganic substances) contained in a solution. TDS describe the amount of solute in parts per million (ppm) or the same as milligrams per liter (mg / L). Generally based on the above definition should substances dissolved in water (solution) must be able to pass through a sieve with a diameter of 2 micrometer (2 × 10-6 meters). Applications commonly used is to measure the quality of the irrigation fluid, aquarium maintenance, swimming pools, chemical processing, manufacture of mineral water, etc. (Misnani, 2010).

Total dissolved solids can also be a number of ion concentration of cations (positively charged) and anions (negatively charged) in the water. Analysis of total dissolved solids is a qualitative measurement of the amount of dissolved ions, but does not elaborate on the nature or ion relations. In addition, testing does not provide insight into the specific water quality problems. Therefore, the analysis of total dissolved solids is used as a test indicator to determine the general quality of the water.

Source of total dissolved solids can include all cations and anions dissolved (Oram, B., 2010). The main source for TDS in water is an abundance of farming, household waste, and industrial. The most common chemical elements are calcium, phosphate, nitrate, sodium, potassium and chloride. The chemicals can be cationic, anionic, molecules or agglomeration of thousands of molecules. TDS content that is harmful pesticides arising from surface runoff.

Some total dissolved solids naturally derived from the weathering and dissolution of rock and soil (Anonymous, 2010). Thresholds of TDS is allowed in the river is 1000mg / L. Increased dissolved solids can kill fish directly, increasing the disease and lower the growth rate of fish as well as changes in behavior and decline in fish reproduction. In addition, the quantity of natural food fish will wane (Alabaster and Lloyd, 1982).