Triton Co3- Used to increase the carbonate hardness of the water (alkalinity). Use this instead of turning the dosing up on the four part Base Elementz IF calcium and magnesium levels are maxed out and if more alkalinity is needed to maintain the level at 8dkh. Remember, rthe Base Elementz are to be dosed at the same rate so if alkalinity needs a boost and the calcium and magnesium are already very high, this product will come in handy. 100ml will increase 25 gallons of system water by 3dkh. Please calculate the dosage for your specific aquarium or contact us for more info.