Quality aquarium additives are essential to the health of your reef tank and the vitality of its inhabitants. BulkReefSupply.com carries our own line of BRS branded dry supplements: Calcium, Alkalinity, Magnesium and Kalkwasser. Our BRS aquarium supplements come in bulk containers or in convenient kits and packages to make calcium and alkalinity maintenance easy whether manually added or using 2 part dosing equipment. We also carry liquid calcium and alkalinity products from the trusted brand ESV. Additionally, we stock elements such as Potassium, Iodine and Strontium from ESV, Two Little Fishies, Elos and Korallen-Zucht.