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GroTech High Performance Calcium Reactors All GroTech calcium reactors of this series are equipped with the newly developped gas reduction chamber GRK1. This chamber ensures that the discharge water of the Calcium reactor will be refed into the aquarium with an optimum kH-value, high Ca-content as well as with a pH-value which corresponds to the one of the aquarium. Small construction sizes, gas reflow and the gas reduction chamber for residual gas removal make the HKR that much efficient and unique.     GroTech HCR 070 High Performance Calcium Reactor   £199.95      GroTech HKR 110 High Performance Calcium Reactor   £259.95      GroTech HKR 150 High Performance Calcium Reactor   £329.95      GroTech HKR 200 High Performance Calcium Reactor   £499.95      GroTech Gas Reduction Chamber for Calcium Reactors   £69.95

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