TDS in aquarium. What is it?
Once, when exchanging fish, one of my acquaintances, an aquarist, said that he does not transfer fish to another aquarium until the parameters are equal TDS. For me it was a completely unfamiliar word, I became interested in it and began to search for information on the Internet.
So, TDS - is short for English words. (total dissolved solids), and stands for “the total amount of dissolved solids in water, including salts”. Therefore, a measurement device is commonly called “TDS-meter "or" salinometer. And it shows “total water mineralization”. The readings in parts per million water molecules are measured in ppm (parts per million).
TDS and water hardness.
When you first encounter TDS, immediately thoughts come to mind that with the help of a “salimeter” it is possible to measure the hardness of water. After all, it directly depends on the so-called “hardness salts” dissolved in water. (calcium and magnesium salts). and even give the formula that if you divide the tester testimony by 17.8, then we get the rigidity in the usual German degrees.
But in fact, this is a fallacy, and it can be very easily dispelled. Make water tests for hardness, add regular salt (sodium chloride) into the water and repeat the measurement. The hardness of the water will not change, but the readings of the device are too high. So, without a drop test for stiffness, alas, can not do. Also in the aquarium phosphates, nitrates and other chemical elements will affect the readings.
TDS-meter. Review and examples of my tests.
TDS-meter, is a device made in the form of a pen with a digital display and 3 buttons. At the end are 2 metal rods, which must be immersed in water for testing. I note that the device can measure not only the total salinity of the water, but also the temperature. I will also say that the device is not purely aquarium, and is mainly used to determine the quality of drinking water.
Table of water quality from the manufacturer of the tester.
Note! Distilled water is purified water with the help of special distillation apparatus. Practically does not contain any impurities and salts. There is also bidistilled water — that is, twice purified water.
Based on the table above, the norm for distilled water is from 0 to 5 ppm. My device shows 16 ppm. Since the device is one, and there is nothing to compare the readings with, then it will not be possible to find out why the error is obtained. Either in water or in the calibration of the instrument. In any case, the error is not significant.
Next, measure the water from the tap.
As the test shows, this water can be safely drunk. But if you let it through a kitchen charcoal filter, then the readings fall to 74ppm. So the carbon filter works and the device can be trusted.
And the last test is the test of water from our one aquarium.
From the photo we see that the device shows 132ppm, and theoretically, you can easily drink water from the aquarium :)
Price in one online store! And how many TDS really worth it. Shock!
To begin with, I post a screenshot of the price from one Latvian online store.
To sum up.
I do not consider this device directly at 100 percent as a necessary device when doing aquarium work, such as for example a thermometer. Especially if it will be expensive. But if you suddenly need to order a cheap thermometer from China, for the same money you will get a thermometer and TDS-meter. Also with batteries included. And he measures the temperature quite accurately.
And how to choose a thermometer, read in the next post.
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