Hy, what can I say), I buy the water conditioner only when hunting Pardies because I or with the quality and quantity, grade for larger aquariums, am very satisfied, it is in the long run really counted, whether to buy expensive small amounts, equal something mehr.Ich got so far in any of the aquarium water problems, neither with nitrates or with other interfering substances. The fish are doing well, the water balance keeps stabil.Immer again like that amazing is off even without Prime, delivery the next day was already with me! Clear Best Buy, Thanks, 5 star