Red Sea Max Nano 225 Thin-Mesh Filter Sock Bag (x2)

When combined with our reef care recipes, it will maximize pigment saturation to bring out your coral's most vivid colors, while encouraging growth up to twice the natural rate. Red Sea Salt's Alkalinity of 8dKH makes it ideal for all reef aquarium types, and especially SPS-dominated tanks.Natural seawater includes over 70 chemical elements. Most of them influence the water parameters, but only a few play a significant role in its overall chemical stability. These elements form the foundation of the reef environment and include three major elements: Calcium, Magnesium, and Bicarbonates.The three 'foundation elements' have a major effect on pH stability, Alkalinity, seawater ionic strength, and many of the coral's biological processes (skeleton formation, ion-exchange, photosynthesis).Unlike the natural reef environment, where there is an immense reservoir of the foundation elements, the reef aquarium has limited resources that are quickly depleted by the aquarium inhabitants. Therefore, in order to enable sustainable coral growth, it is necessary to maintain higher than natural levels of the foundation elements.Original research carried out in Red Sea's laboratory has shown that when increasing the levels of the foundation elements above the natural sea levels, a very specific ratio between the foundation elements is necessary for coral vitality, and the formation of a robust aragonite coral skeleton.Red Sea Salt is made according to these ideal ratios, removing the need to adjust the levels of foundation elements after water changes, and providing your corals with a healthy and stable home.

Most refractometers used within the aquarium hobby are not specifically designed for reef aquariums and use an algorithm for the measurement of brine (NaCl – rather than seawater) and at a temperature of 15oC/59 0F rather than 25oC/77 0F. Thus, a measurement deviation of up to 1.5ppt is possible, which can have a significant adverse effect on coral growth and coloration.Main features of Red Sea's Seawater Refractometer include:Directly reads the absolute salinity of seawater at 25°C/77 0F ( No need for seawater or temperature compensation factors)Specifically designed for the ionic content of seawater (NSW) for more accurate salinity measurement (industry standard refractometers are calibrated for salt brine ).Calibrated for seawater (NSW) at 25oC/77oF, the normal temperature range for reef aquariums(most standard refractometers are calibrated at 15oC/59oF ).Easier to read, higher resolution display, focussed to the relevant range for reef aquariums of up to 40pptIncludes Integrated Automatic Temperature Compensation (ATC) for accurate measurement at standard ambient temperature.Red Sea's Refractometer displayThe PPT scale on Red Sea's Seawater refractometer is calculated using an algorithm for seawater and therefore will give a reading of the Absolute Salinity of seawater.The PPT scale on regular salinity refractometers are calculated using an algorithm for Brine. Using a Brine refractometer for Seawater will give an error of approximately 1.5ppt in the salinity reading.About SalinitySalinity is a general term describing the concentration of salt in water. However, solutions of different type of salts have different refractive indexes.Brine is a solution of Sodium Chloride (table salt) that contains 2 chemical elements.Seawater contains approximately 70 chemical elements that include Calcium, Magnesium, Potassium etc. in addition to the Sodium Chloride.Seawater and Brine of the same salinity (i.e. the same weight of salt/liter) have different refractive indexes and will give different salinity readings if measured on the same refractometer.Refraction & refractive indexAll transparent materials such as liquids refract (distort) light.All transparent materials refract light differently and have what is called a "refractive index" which means how much a particular material distorts light.Different concentrations of the same liquid have different refractive indexes.The scale of a refractometer is calculated by using a mathematical algorithm that relates the measured refraction to its concentration for a specific liquid.Refractive index and temperatureThe refractive index of liquids change with temperature and therefore has a major effect on measuring salinity with a refractometer.The algorithm for defining the PPT (and S.G.) scale for a refractometer is calculated for a specific temperature.PPT readings from refractometers that are not calibrated for reef aquariums (i.e. 25oC) need to be adjusted according to a conversion table to give the actual PPT at the aquarium temperature. This is often a cause for misinterpretation of refractometer readings.For example, using a seawater refractometer calibrated at 20oC will give a PPT reading that is approximately 1-1.5ppt lower than the absolute salinity of the same water sample at the normal aquarium temperature of 25oC. Therefore, Red Sea's Seawater Refractometer calibrated at 25°C/77 0F directly reads the absolute salinity of seawater with no need for temperature compensation factor)

Calcium, magnesium, strontium and carbonate are the basic foundation elements of coral skeletons.All of these elements need to be available in balanced proportions for positive coral health and growth.Concentration:Liquid supplement: 1ml will raise the Ca level of 100 liters (25 gal) by 2ppm.Powder supplement: 1g will raise the Ca level of 100 liters (25 gal) by 3.6ppm.1 kg will make 1.8L of stock solution.package size/volume:1 L (33.8 fl. Oz.)