Nyos ALKALINITY+ is a high purity sodium bicarbonate. High purity salt with no organic impurities Quick and easy way to adjust the carbonate hardness (alkalinity) Ideal for any 2 part dosing system Pre-mixed solution (recommend): Mix 160g (5.64oz) of ALKALINITY+ to 2000ml (0.53gal) of RODI water. 38ml (4.8fl oz) of this solution will increase the KH in a 100L (100gal) aquarium by approximately 1°dKH (1°dKH). This is a reference value; the actual dosage amount may vary. Dosing ALKALINITY+ powder directly: Dose in the sump or pre-mix with aquarium water. 30g (0.4oz) of ALKALINITY+ will increase the KH of a 1000L (100gal) aquarium by approximately 1°dKH (1°dKH).