D-D ( Deltec ) Rowa Phos The ultimate phosphate removal media for freshwater and saltwater aquariums * Unsurpassed phosphate binding power * A small amount of media removes a lot of phosphate * Easy to use * Effective visible control of algae growth * Reduces silicate and some heavy metals * Will not release phosphate back into water when loaded * Does not release substances such as aluminium back into the water (which can occur when using some other products) * Enhances coral growth by avoiding phosphate related inhibition of lime synthesis in calcareous algae and hard (stoney) corals etc The binding (adsorption) capacity of RowaPhos is approximately 25g of phosphate per kg of media.
D-D ( Deltec ) Rowa Carbon High performance activated carbon for crystal clear water in freshwater and saltwater aquariums. Rowa Carbon is an unusually high-performance activated carbon based on the finest quality hard coal and contains extremely low levels of Phosphate.
Within the aquarium activated carbon will remove toxins and yellowing from the water which will improve the health of your livestock and improve the penetration of light leaving your aquarium crystal clear.
Many low cost carbon products on the market place are washed in phosphoric acid as a final stage of their preparation and can release high levels of Phosphate into the water. Rowa Carbon Contains extremely low levels of Phosphate.
Problems with algae are often caused by the release of phosphate from activated carbon with high POI (Phosphate Output Index) levels - often as high as 14.0, which inhibits lime synthesis in coralline algae, corals and other organisms that deposit lime.
Rowa Carbon is distinguished by its exceptionally low POI level of only 1.3 which is considerably below detection levels of phosphate test kits available to the hobbyist.
Features
-Highly active -pH balanced -comes in pelleted form -minimal phosphate levels -Large surface area
D-D ( Deltec ) Rowa Kalk Kalkwasser translates from the German for limewater and is one of the oldest and most widely established methods of adding calcium to the reef aquarium as first introduced by Peter Wilkinson a Swiss aquarist. Kalkwasser is a solution made by dissolving Calcium Hydroxide in water. The resultant fresh solution is alkaline with a pH of 12.4 and contains a ready supply of both Calcium ions and Carbonate ions.
Both of these ions are useful to the aquarist as the Calcium ions are available to the corals and the Carbonate ions help to buffer the pH. In addition to adding calcium, Kalkwasser also has the benefit of adding hydroxide ions, which react to neutralise organic acids in the aquarium that otherwise would exhaust the buffering capacity of the system, thus countering the natural tendency within the aquarium towards falling pH. It also helps precipitate phosphates from the water, which fuel nuisance algae growth and inhibits calcification of stony corals.
Kalkwasser contains no other ions that would otherwise cause an imbalance in the water chemistry.
If the evaporated water loss is from the aquarium is replaced with kalkwasser then it will add calcium and offer the other benefits described above. The solution however is highly reactive with CO2 in the air forming insoluble calcium carbonate. The reaction with CO2 significantly reduces the free calcium ions from 900mg/l in the fresh solution at pH 12.4 to 5-6mg/l at pH 10.
For this reason it is necessary to continually make a fresh solution and to keep it away from the atmosphere. This is where a Deltec Kalkwasser stirrer may come in to play as it makes up fresh saturated solution as it is used up.
Note that great care must be taken when administering Kalk due to the great affect that it has on the pH of the aquarium.
Kalkwasser is ideally dosed after the lights have gone out on the aquarium to counter the natural drop in pH which occurs when photosynthesis stops.
