Rowa kalk Rp 375.000 /bottle 1000ml Germany  

 

It has long been known in a reef aquariums that the inhabitants are constantly in need of calcium to build their skeletons and shells.
To obtain the best results, you should use DO or RO water. Dosing should take place at the lowest point of the pH cycle. This normally being at night approximately 5 to 6 hours after the light have been turned off. Attention should be paid to the pH when dosing as it could rise to dangerous levels if administered to fast.
The pH of calcium hydroxide when first mixed in RO or DI water should be 12.45.
 

Grotech Kalkwasser 500g

AQUAPHARM Pur KALKWASSER™   USA empty

Rp 100.000/bottle (200g)      
Maintains Calcium and Alkalinity
AquaPharm Pur KALKWASSER™ powder is pure
calcium hydroxide that is used to prepare Kalkwasser
solutions that will help to maintain high calcium
concentration and alkalinity or carbonate hardness (KH)
in aquariums. A wide variety of invertebrates in reef
aquariums including soft and hard corals, mollusks,
crustaceans, clams and calcareous algae absorb calcium and carbonate from the water for protection, body support (skeletons) and calcification.