2HR Aquarist APT s/Sky

2HR Aquarist APT s/Sky

  • Water conditioner for soft water
  • Compatible with hard and soft water plants
  • Supports shrimp keeping
  • To adjust the GH-level
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APT s/Sky by 2HR Aquarist is a water conditioner that allows aquatic plants to thrive regardless of the hardness of the water. It also favours the cultivation of shrimps in soft water. s/Sky contains an optimal blend of soluble calcium and magnesium salts, trace elements and seaweed extract in a uniform mixture. This blend is safe and non-toxic to aquatic life and is readily soluble in water. With APT s/Sky, the general water hardness in the aquarium can be adjusted exactly to the needs of the inhabitants and aquatic plants, so that all inhabitants are comfortable. APT s/Sky adjusts the GH-value in the aquarium without having a negative effect on the NPK, KH-value and pH-value. At the same time, a balanced amount of necessary minerals, such as calcium, magnesium, iron and trace elements, is introduced into the tank for an optimal GH-value.

Dosing Guide - - download PDF


  • Allows hard and soft water plants to grow side by side
  • Water conditioner to adjust the total hardness
  • Optimal mixture of soluble calcium and magnesium salts, trace elements and seaweed extract
  • APT s/Sky is available in 150 g and 800 g package.


If you have softwater or use osmosis water, then simply add 15ml per 60L.

We recommend the s/Sky dosing instructions to determine the exact dosing amount. For the very first dose: water volume = water volume of the tank. The GH-value is the current value in the aquarium.
Then, during the water change: water volume = volume of the newly added tap water. GH-value = GH-value of the tap water.

It is recommended to first mix APT s/Sky with some water in a small container and then add the milky solution to the tank. If the flow is good, the APT s/Sky powder can also be added directly to the tank. It is fine if it covers the plants.


  • Calcium (Ca) 21,5 %
  • Magnesium (Mg) 5,4 %
  • Boron (B) 7 mg/l
  • Cupper (Cu) 1 mg/l
  • Iron (Fe) 0,06 %
  • Manganese (Mn) 17 mg/l
  • Molybdenum (Mo) 0,01 mg/l
  • Zinc (Zn) 0,01 mg/l
  • Seaweed extract

2HR Aquarist

2HR Aquarist

The 2HR Aquarist is a young company with its roots in Singapore. The founders around the passionate aquascaper Dennis Wong, all aquaristic enthusiasts themselves, see aquascaping as a mixture of art and research. The development of the products, therefore, corresponds to a scientific approach in which empirical tests are used to create foundations and facts. The innovative APT fertilizer series from The 2HR Aquarist covers the most common scenarios that can arise in aquascaping and places healthy plants and balance in the aquarium in prospect.

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