People who are constantly engaged in cultivation or content of aquarium fish should always be aware of two types of water hardness .Complete or total rigidity (GH) is a complex response that is based on the amount of water present in the calcium ion, magnesium, barium and strontium.These elements should be contained in the composition of sulfates, bicarbonates, nitrates and chlorides.Carbonate stiffness (CN) can be identified by the presence of calcium and magnesium bicarbonates.Remove these elements can be by boiling.That is why we can say that the carbonate liquid temporary stiffness .
At that time, when there is boiling water , soluble bicarbonates to the insoluble carbonates decompose, f
orming a precipitate.He knows every person who at least once boiling water in a kettle.The other faction, which by boiling is not removed, up permanent stiffness .It can be calculated by subtracting from the total carbonate hardness.
If there is a freshwater aquarium ground, the stiffness water can sometimes rise.The fact that in the marble, dolomite and coral sand contains calcium carbonate and magnesium, which upon reaction with carbonic acid is converted into a soluble bicarbonate.There is increasing carbonate acid and total hardness.
If you live in an aquarium fish, which is contraindicated in hard water, it is necessary to seriously approach the choice of soil.To check the gravel is usually used ordinary household vinegar.If it comes in contact with the hiss of gravel, then it contains calcium and magnesium carbonates.Also, there are now quite a few different testers, who very accurately determine the stiffness water in the aquarium.However, the popularity they have not received.People use them rarely.