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aquavitro Eight.Four - 350 ml Cough Merrick Grain-Free Puppy Dry DogMany competing buffers for reef aquaria are simply sodium bicarbonate. Such buffers have a pK or only 8. 0 in saltwater and simply are unable to maintain a pH above 8. 0. The low buffering pK is a function of the low carbonate bicarbonate ratio. eight. four supplies a properly balanced (carbonate bicarbonate) buffer system that yields an industry leading pK of 8. 6 which makes pH maintenance of 8. 3 8. 5 easy. A higher pK increases the buffer's