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CALCIUM REACTOR   
Brand: Knop
KNOP-Calcium Reactors - for stable aquarium conditions size: 17"L x 6"W x 20"H KNOP Calcium Reactors increase the carbonate hardness in your aquarium and stabilize the p ... more

KORALITH PURE CALCIUM CARBONATE   
Brand: Knop
(15lbs) Reactor Media is placed into your Calcium Reactor where the injected CO2 dissolves the calcium into the water. Our high quality reactor media dissolves easily and ev ... more
$38.00  BUY
NEW S IV CALCIUM REACTOR   
Brand: Knop
KNOP-Calcium Reactors - for stable aquarium conditions KNOP Calcium Reactors increase the carbonate hardness in your aquarium and stabilize the pH value. Additionally, KN ... more
$599.00  BUY