[edit] °GH - General Hardness
General, total or permanent hardness is a measure of the overall concentration of calcium, magnesium and other ions. It's measured in degrees, with one degree equal to about 17.9mg/l (17.86mg/l).
General Hardness - General hardness is a measurement of the total dissolved minerals (calcium and magnesium) in your water. When your water has low amounts of dissolved minerals, it is considered “soft.
General hardness (GH)-Measured in mg/l or ppm. Mainly a test for freshwater aquaria. Test kits are used to measure this most often. General hardness is the measure of calcium (Ca++) and magnesium (Mg++) ion concentrations dissolved in water.
General Hardness (GH)
GH primarily measures calcium and magnesium ions. It is important for breeders (some species require very soft water, which is hard to maintain, requiring constant monitoring for maximum success).
General Hardness - The measure of calcium (Ca++) and magnesium (Mg++) ion concentrations dissolved in the aquarium water.
Heater - An electrical device used to heat the aquarium water.
General Hardness
General Hardness, or gH as it is also known, is primarily the measure of calcium (Ca++) and magnesium (Mg++) ions in the water.
General Hardness
General hardness can be expressed as ppm or degrees. One degree of general hardness in the USA is the equivalent of 17.86 mg CaCO3 (calcium carbonate) per liter (1 mg/l = 1 ppm for our purposes).
General Hardness (GH) measures the cations (+ charge); for calcium and magnesium.
Carbonate Hardness (KH) Refers to only the bicarbonate, and carbonate anions(-charge); it does not measures the sulfates and other anions.
General Hardness (GH)
Now general hardness sounds like the same thing as carbonate hardness but its a different thing so don't mix up! General Hardness or GH is the measure of calcium and magnesium ions in water.
General Hardness tells us how "hard" or "soft" water is, which is sometimes a bigger issue for laundry than for aquariums.
GH : General Hardness (magnesium and calcium carbonate). Some fish (Discus for example) require a very soft water (low GH values, 1-4) while others require a high GH (like African cichlids from the Rift Lakes; values over 12 recommended).
Unlike the general hardness (GH) which is used to describe fresh water, carbonate hardness (CH) is used in sea water, where it serves to measure the quantity of calcium and magnesium carbonates and bicarbonates present.
Measure the general hardness, alkalinity, and pH of the water with a test kit. Purified water will have a general hardness of 0 GH, alkalinity of 0 dKH, and a pH of 7.0.
upward moving column of water suspends the media and provides a large surface
area for bacteria. This provides excellent biological filtering.
General Hardness - The measure of calcium (Ca++) and magnesium (Mg++) ion ...
There are two types of water hardness: general hardness (GH) and carbonate hardness (KH). A third term commonly used is total hardness which is a combination of GH and KH.
A General Hardness between 11 and 30 is appropriate. Plenty of hiding places should be offered. Gold Mollies normally do well with other fish. Gold Mollies are fed zucchini, lettuce, and peas.
Part 2: CONDUCTIVITY AND GENERAL HARDNESS
Summary: "In the previous article we discussed water's ability to dissolve ions and molecules (solutes) is determined by the fact that the water molecule has two polar, opposite charges (dipolarity).
Of the two types, there is General Hardness (GH), which refers to the total quantities of ions dissolved in the water and Carbonate Hardness (KH - the standard adopted is German, in which 'carbonate' is spelt with a K...) which deals with the ...
General Hardness (GH) Kit
You may want to get one of these, but having one is not critical. You don't need to know the exact hardness level. Knowing whether your water is ``soft'', ``very soft'', etc. is good enough.
They are pH, buffering capacity, general hardness and salinity. In addition, there are several nutrients and trace elements.
pH
pH refers to water being either an acid, base, or neither (neutral).
Local Water pH & GH (General Hardness)
Some fish like a high pH and others like a low pH, some like soft water and some like hard water. It’s important to choose fish that like the same conditions.
Carbonate Hardness and General Hardness
The two different types of hardness KH and GH are often confused.
dH is a measure of the degree of General Hardness of water based on the amount of dissolved calcium carbonate present. General hardness can also be measured in ppm (parts per million).
Hardness (GH) ...
5 and the general hardness in the area of 1° to 3°dH. The fish will breed at levels above this but problems arise when it's time for the fry to emerge from the egg.
It's engineered to lower the pH and general hardness (GH) of the water (this effect is not to be confused with the lowering of pH associated with adding CO2; simply lowering the pH using Aquasoil is not adding any CO2!).
Get water test kits that will test the General Hardness and the Alkalinity of the water. You want both readings to be 0. If the test readings start to trend higher you will know that you soon need to replace the membrane and/or cartridge.
gH
"General" or "Total" hardness. Also called dgH (degrees of general hardness). A measure of all dissolved solids in water, including carbonate hardness (kH).
The term 'dH' is never truly defined (it means 'degrees of hardness'), and General Hardness and German Hardness could both be abbreviated as 'GH'. Reagents do not have an expiration date. Titration endpoint is very apparent and 'clean'.
Test Kits: In order of importance: PH (possibility of hydrogen), ammonia, nitrite, nitrate, GH (general hardness) and KH (carbonate hardness)
Knowledge of the Nitrogen Cycle and how it relates to fish tanks.
This fish will accept a wide PH range and a general hardness range of 4-30 dH. Sexing and breeding information on this fish is unknown.
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Water hardness is measured in ppm (part per million), kH (carbonate hardness), and dH (degrees of hardness) or gH (general hardness). Water is expressed as soft (having few dissolved minerals) or "hard" (having many dissolved minerals.
The ideal setup for the Nanochromis is an aquarium of at least 30 gallons with plenty of plants, rocks, and driftwood for setting up territories and hiding. Unlike other African Cichlids, this fish prefers an acidic pH and a low, general hardness.
They provide the information necessary for tailoring characteristics such as pH, Carbonate Hardness (KH), Iron (Fe) and General Hardness (GH) that are important for the particular type of aquarium being maintained.
It received indirect lighting from the room and a nearby window. The pH measured in at 6.8 (slightly acidic). Both the GH (general hardness) and CH (carbonate hardness) tested to be extremely soft, with less than one degree of hardness.
The two added together give a total that is often referred to as General Hardness.
Heater-bi-metallic strip
Bi-Metallic thermostats operate with a strip of two different fused metals that expand an contract differently.
 See also: Water, Fish, Aquarium, Plants, Carbon
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