Aqua Care Turbo Calcium Media, 2.5 kg. The AquaCare Turbo granules is a pure material consisting of calcium carbonate and magnesium carbonate. The highly porous structure builds a very large surface, that realizes high amounts of dissolved matter. The small round shaped granules are best in a high flow system like the AquaCare Turbo Chalk (calcium) Reactor. Advantages of the Turbo granules compared to other materials The most important fact for a calcium reactor material is the solubility. The higher the solubility the more calcium and carbonate hardness will be produced the more effective is the calcium reactor. Additionally the CO2 consumption is lower. If a material is pure, harmful substances like heavy metals cannot pollute the reef system. Additionally raises the solubility with the grad of quality. This is the reason why Turbo granules are better soluble compared to e.g. coral gravels, although coral gravels has a porous structure, too. Some aquarist think that they can dissolve all substances out of the coral gravels. But some of the elements are very strong bounded and it is not possible to get them out of the coral structure with a chalk reactor. Some other elements that corals need are not bounded in the coral skeleton. Coral gravels cannot supply the the reef organisms with trace elements. So it is better that the chalk reactor has only one duty: producing calcium and KH. All other trace elements must be supplied with care solutions. In the coral skeleton structure phosphate is bounded in organic matter. If the chalk reactor dissolves the coral gravels phosphate will get into the water because the organic matter will be dissimilated. Normally phosphate is in the reef tank in too high concentrations and an additional source is harmful for the system. Working with old style chalk reactors The Turbo granules can enhance the efficiency of old style chalk reactors. But normally these reactor may not be filled completely with Turbo granules. The maximum filling is 20 cm. The other volume of the reactor should be filled with calcium carbonate gravels size 6-10 mm. Between the first gravels and the Turbo granules a filter sponge should be installed to prevent the mixing of the materials. It is very important that the Turbo granules never reach the circulation pump. If the efficiency is not high enough the best way is the AquaCare Turbo Chalk Reactor.