Calcium is extracted from marine water by all types of invertebrates to build their fantastic skeletal structures. Kalkwasser (lime water) is a highly saturated calcium solution. Calcium and/or Kalkwasser are crucial to the growth of your reef aquarium - you may need strontium and magnesium for calcium processing, so regularly monitor trace element levels.

Calcium can only be extracted from water if pH and hardness are high - use marine reef buffers to achieve proper conditions. Calcium solutions must be added slowly to your water for proper dissolution - use a calcium reactor or kalkwasser reactor to make this easy.



Reef Calcium 500mL $8.87	Liquid Reactor 64 fl oz $40.79	Concentrated Liquid Calcium Supplement 8oz $5.50	Concentrated Liquid Calcium 16oz $9.13



Concentrated Liquid Calcium 64oz $25.16	Turbo Calcium 400gm $15.03	Turbo Calcium 800gm $13.19	Purple Up Coralline Algae Accelerator - 16 oz. $12.68



Reef Advantage Calcium 250g (8.8oz) $7.05	Reef Kalkwasser 1kg (35 oz) $22.04	Reef Kalkwasser 2000g (70oz) $37.43	Reef Advantage Calcium 1kg (2.2 lb) $20.97



Kalkwasser Mix 450gm $11.16	Kalkwasser 1lb $10.95	C-Balance-Two Part Solution-16 oz $11.96	C-Balance - 2-1 Gallon Bottles (Two Little) $27.91



Tech CB Part A 16oz $6.39	Tech CB Part A 64oz $14.20	Tech CB Part A 1 Gallon $14.96	Tech CB Part B 16oz $6.39



Tech CB Part B 64oz $12.33	Tech CB Part B 1 Gallon $19.28	Reef Complete 250mL (8.5oz) $5.80	Reef Complete 2L (67.6 oz) $31.86



Reef Complete 500mL (17oz) $8.87	Reef Fusion 1 - 500 mL - 16.9 oz. $7.01	Reef Fusion 1 - 1 L - 33.8 oz. $11.22	Reef Fusion 2 - 500 mL - 16.9 oz. $7.01



Reef Fusion 2 - 1L - 33.8 oz. $11.22	C-Balance Two Part Solution - Two 32 oz. Bottles $18.56	Purple Tech - 8.7 oz. - 250 g $5.07	Purple Tech - 17.4 oz. - 500 g $9.13



Calcion - 17 oz. - 500 mL $10.60	Calcion - 67.6 oz. - 2 L $30.40	Reef Code A - 67.6 oz. - 2 L $13.80	Reef Code B - 67.6 oz. - 2 L $13.80



Calcion-P - 1.7 lb. - 800 g $17.60	Kalk+2 - 3.5 oz. - 100 g $6.90	Kalk+2 - 15.9 oz. - 450 g $13.90	Reborn - Coral Gravel for Calcium Reactor - 4 kg - 8.8 lb. $21.31



Coralline Gro - 500 ml - 16.9 oz. $10.00	Reef Foundation A - Calcium and Stronium - 1 kg - 2.2 lb. $16.00	Brightwell Reef Code A-P - 17.6 oz. $10.10	Brightwell Reef Code B-P - 17.6 oz. $9.20



Brightwell CoraLazarus - 2.2 lbs $7.80	Fluval Sea Calcium - 8 oz. $8.04	Fluval Sea Calcium - 16 oz. $13.69	Brightwell Reef Code A P - 2.2lb. $13.90



Brightwell Reef Code B P - 2.2lb. $12.70